From the book
Stobaeus, Volume I
John Stobaeus · Diotimos Editions · 2026
Browse this book’s lexicon →Light
φῶς
phōsPhōs is luminous light.
Orientation
At a Glance
- The wordPhōs is luminous light.
- In StobaeusAristarchus’ reported definition makes color light falling upon objects.
- In this editionThe English uses “light” naturally but the notes identify the change between phōs and kouphon.
- A place to beginAristarchus connects color with incident light.
- English renderings
- light; illumination
Meaning
Phōs is luminous light. It differs from the adjective meaning light in weight, even though English uses the same spelling for both.
Use in the book
Aristarchus’ reported definition makes color light falling upon objects. The Stoic notice on weight uses “light” first for bodies tending away from the center and then, with a different Greek word, for luminous light moving in straight or circular courses. The change of vocabulary matters: the final claim does not simply restate the classification of light elements.
Places to read
Translation in this edition
The English uses “light” naturally but the notes identify the change between phōs and kouphon. Readers comparing explanations of vision should keep illumination distinct from the perceived color.
Source note
Wachsmuth, volume I, printed pp. 142, 149.
From the book
The Notebooks of Joseph Joubert, Volumes I–II
Joseph Joubert · Diotimos Editions · 2026
Browse this book’s lexicon →Light
lumière
Light is the eye’s object and one of Joubert’s most productive ways of speaking about thought, spiritual presence, and the visibility of form.
Orientation
At a Glance
- The wordLight is the eye’s object and one of Joubert’s most productive ways of speaking about thought, spiritual presence, and the visibility of form.
- In JoubertAir helps explain how a vague idea can illuminate: it lets light through without itself giving a sharply bounded object.
- In this editionThe English translation preserves “drop of light,” the initial “Until,” and the fragment’s unsupplied referent.
- A place to beginThe eye is assigned light as its object.
- English renderings
- light; lights
Meaning
Light is the eye’s object and one of Joubert’s most productive ways of speaking about thought, spiritual presence, and the visibility of form. The optical image should remain active even when its application is intellectual.
Use in the book
Air helps explain how a vague idea can illuminate: it lets light through without itself giving a sharply bounded object. The qualification is decisive—one may allow a vague idea only of something vague. Waiting for a drop of light turns intellectual reception into a small, concrete event; the fragment does not tell us what “there” refers to or complete the implied sentence.
Light can also be distinguished from movement and mere mental activity, which make one write rather than meditate. The diamond’s essence or soul is described as light modified by vitrification into a starry reflection. This material-spiritual vocabulary cannot be reduced to an abstract synonym such as knowledge without losing the notebook’s imaginative work. Nor should every plural lumières be treated as a reference to a named historical movement.
Places to read
- I, p. 35–36, entry 1, ¶12The eye is assigned light as its object.
- I, p. 278, entry 1, ¶1Air transmitting light explains a qualified use of vague ideas.
- I, p. 473, entry 5, ¶1Illumination is awaited as a falling drop.
- II, p. 477, entry 7, ¶1Light is distinguished from mere mental movement.
- II, p. 762, entry 9, ¶1The diamond’s essence is described as modified light.
Translation in this edition
The English translation preserves “drop of light,” the initial “Until,” and the fragment’s unsupplied referent. It retains “vitrification” and the qualified diamond account instead of converting it into modern mineralogy.
Source note
Beaunier 1938, I, pp. 35, 36, 278, 473; II, pp. 477, 762. Beaunier identifies the early physiological passage at I.35 as a summary of Plato. Its presence records Joubert’s reading, not an independently original anatomical claim.
From the book
Centuries of Meditations
Thomas Traherne · Diotimos Editions · 2026
Browse this book’s lexicon →Light
light; illumination; enlightening; beams
Light is what makes visible.
Orientation
At a Glance
- The wordLight is what makes visible.
- In TraherneThe sun’s familiar light exposes the failure of gratitude: people would lament its absence yet despise it because it is present.
- In this editionKeep the literal optics active within the metaphor.
- A place to beginThe neglected sun shows how familiar illumination can occasion moral blindness.
Meaning
Light is what makes visible. Its extended senses name intelligibility, the soul’s apprehension, and the communicable power by which one person enables another to see.
Use in the book
The sun’s familiar light exposes the failure of gratitude: people would lament its absence yet despise it because it is present. Here actual illumination supplies both a material benefit and an image of a benefit made invisible by custom.
The soul’s light is equally relational. In III.6 the writer proposes to show the reader the universe through his own apprehension, making autobiographical disclosure a gift of sight. II.78 gives the relation a more exact optical shape: beams become manifest through the objects they illuminate, just as powers become known through their exercise. Light is therefore not merely a synonym for certainty. It figures the reciprocal manifestation of perceiving power and perceived world.
Places to read
In this edition
Keep the literal optics active within the metaphor. Beams, objects, and reflection explain the argument more precisely than replacing every light with knowledge.
Source note
From the book
The Green Notebook
Maurice de Guérin · Diotimos Editions · 2026
Browse this book’s lexicon →Light
lumière; lueur; éclat; rayon; clarté
Lumière names light broadly; lueur often suggests a gleam or lesser glow; éclat emphasizes brilliance, and rayon a directed ray.
Orientation
At a Glance
- The wordLumière names light broadly; lueur often suggests a gleam or lesser glow; éclat emphasizes brilliance, and rayon a directed ray.
- In GuérinLight often behaves like a moving substance.
- In this editionLueurs molles et tendres becomes soft and tender glimmers in March 1835.
- A reading distinctionThe July 1833 failure of sunlight and the December 1834 torch image concern different dates and situations; together they establish a recurrent problem, not one continuous reported episode.
Meaning
Lumière names light broadly; lueur often suggests a gleam or lesser glow; éclat emphasizes brilliance, and rayon a directed ray. Their distinctions help Guérin write not simply about seeing, but about degrees and movements through which a scene becomes visible.
Use in the book
Light often behaves like a moving substance. It pours through cloud-clearings, floods the gaze, descends suddenly into a forest, or leaves a luminous band above the horizon. These images do not erase optical precision. The April cloud study follows illumination across successive ranks and distinguishes bright projections from shadowed recesses. The March forest scene is especially resistant to an easy symbolism: a sudden sunbeam gives the darkness a disturbing, almost deathly animation rather than dispelling its terror.
Twilight softens instead of simply diminishing. The sun’s remaining light tempers black shadows, and later recollection imagines evening glow as the beneficent sediment of a river of light. Such effects depend upon a transition distributed through atmosphere and time.
The connection between light and understanding is consequently unstable. In December 1834 Guérin’s former imaginative attention is compared to carrying a torch: objects acquired otherwise unseen beauty. When that power fails, he seems to project shadow instead. Light belongs both to the world and to the way it is received. The notebook preserves their difference whenever real sunshine cannot relieve inward cold.
Places to read
- 19 March 1833 · ¶1A sudden ray makes the forest strange rather than reassuring
- 2 April 1833 · ¶1The description follows gradations of illumination and distance across clouds
- 2 October 1833 · ¶1A narrow luminous band gives distant poplars the appearance of ship masts
- 10 December 1834 · ¶3The lost torch of imagination exposes the observer’s role in perceived animation
- 24 March 1835 · ¶2Twilight is imagined as a calming deposit left by the day’s luminous river
Translation in this edition
Lueurs molles et tendres becomes soft and tender glimmers in March 1835. The tactile adjectives remain: light is not just measured brightness but something felt as softness. Conversely, éclat can mean brilliance without requiring the event of a sudden flash.
Source note
The July 1833 failure of sunlight and the December 1834 torch image concern different dates and situations; together they establish a recurrent problem, not one continuous reported episode.
From the book
René
François-René de Chateaubriand · Diotimos Editions · 2026
Browse this book’s lexicon →Light and the moon
lune; soleil; lumière; phare
Light makes things visible while also organizing emotional and spiritual contrasts.
Orientation
At a Glance
- The wordLight makes things visible while also organizing emotional and spiritual contrasts.
- In RenéThe frame's sunrise composes a magnificent landscape whose apparent harmony contrasts with René's disturbed confession.
- In this editionThe translation's elevated “orb” for astre follows the register of the French.
- A place to readL'aurore se levoit — The confession opens within a collectively viewed sunrise.
Meaning
Light makes things visible while also organizing emotional and spiritual contrasts. The sun marks collective and cosmic time; moonlight favors memory and reverie; a lamp can invite conjecture about an inaccessible life. These images do not all signify revelation in the same sense.
Use in the book
The frame's sunrise composes a magnificent landscape whose apparent harmony contrasts with René's disturbed confession. Chactas cannot see it, which immediately limits any equation of visual access with understanding. His later counsel depends on experience and hearing rather than the beautiful prospect available to the younger man.
Moonlight animates tombs and the imagined Genius of memories; later the moon becomes a pale ship plowing cloud-waves. Its mobility participates in René's restless analogies. By contrast Chactas's image of Father Aubry makes the moon steady above drifting clouds. The same celestial body can figure reverie's susceptibility or spiritual constancy, depending on the comparison.
The convent's light is similarly double. It becomes a stable beacon against the ships' shaken lanterns, but René cannot know from that small light exactly who is inside or what she is doing. The question “Was it you?” guards the difference between an image of security and verified knowledge. Illumination can guide the gaze while leaving the other person's interior undisclosed.
Places to read
- p. 141L'aurore se levoit — The confession opens within a collectively viewed sunrise.
- p. 149cet astre qui alimente les rêveries — Moonlight feeds, rather than corrects, imaginative activity.
- p. 163comme un pâle vaisseau — The moon participates in the book’s maritime transformations.
- p. 187le phare immobile du couvent — Stationary light contrasts with endangered navigation.
- p. 188la lune dans une nuit orageuse — Chactas gives the image a different ethical role.
Translation in this edition
The translation's elevated “orb” for astre follows the register of the French. A reader should distinguish the literal light at the barred window from the metaphorical beacon in René's subsequent arrangement of the scene. Both belong to his narrated viewpoint.
From the book
Marsilio Ficino’s Platonic Theology, Volume I
Marsilio Ficino · Diotimos Editions · 2026
Browse this book’s lexicon →Light and illumination
lumen; lux; visus; oculus; acies; perspicacia; perspectio; splendor; radii; lumen invisibile; lumen luminum; illuminare; illustrare; umbra; infusio; serenior; mentis aciem; lucida; obscura; mutatque figuram; lux se ipsa videns.
Lux and lumen both name light; splendor a radiance; radius a ray; illuminare or illustrare the activity of lighting.
Orientation
At a Glance
- The wordLux and lumen both name light; splendor a radiance; radius a ray; illuminare or illustrare the activity of lighting.
- In the Platonic TheologyLight connects reception of truth, purity, causal diffusion, differentiated effects, and presence.
- In this editionKeep the optical examples distinct: visible light’s spread, imagined divine rays, candlelight co-presence, and colored-window differentiation explain different relations.
- A place to readLight seeing itself and sight shining express divine self-knowledge without a separate organ
Meaning
Lux and lumen both name light; splendor a radiance; radius a ray; illuminare or illustrare the activity of lighting. Visus, oculus, and perspicacia move from sight and eye to insight. The text does not establish an invariant technical division between lux and lumen.
Optical clarity, mental receptivity and divine illumination are connected but not identical senses. Acies is the sharp gaze or directed visual power of mind here; serenior describes the purified soul as clearer or more serene. Lux and lumen should be read locally rather than assigned a rigid metaphysical division unsupported by these units.
Use in the book
Light connects reception of truth, purity, causal diffusion, differentiated effects, and presence. The Proem's governing analogy is that minds require God's light as sight requires sunlight. Mind is the eye of soul: it apprehends truth but is not identical with truth. Book I imagines the whole body transformed into an eye to model angelic mind's comprehensive reception without turning from object to object; even then, eye and light remain distinct. Divine self-knowledge exceeds that arrangement and is described as light seeing itself and sight shining by itself, with no separate receptive organ.
The natural and divine uses remain analogical. Sensible light appears in examples of fire and vision, while a comparison of two supposed supreme lights argues for purity: differentiation would require something other than pure light, undermining supremacy. Visible light's diffusion supplies an image of unlimited invisible divine presence, but imagining divine rays as extended lines would falsely put God into bodily space. In the reported theory of universal mental presence, several candles illuminate the same hall while retaining distinct relations to their sources. In the causal argument, one sunlight appears red or green through differently colored windows; intermediaries explain differentiated effects without becoming independent sources. These comparisons serve different purposes rather than forming one physical identification of God with illumination.
Illumination also explains the communication of intellectual form and stable actuality. Angel receives intelligence by illumination; soul receives its stability from divine light while remaining multiple and temporally mutable through its lower grade. The creation-and-illumination account qualifies its priority as being so in a certain sense, so the reception should not automatically become an ordinary elapsed-time process in an otherwise immovable angel.
The Sun–Mercury–Moon analogy distinguishes an unchanged source from different modes of reception. The sun corresponds to God; Mercury, said to receive all its light completely, to angel; and the moon's changing reception over time to soul. Ficino extends the comparison of Mercury to the superlunary stars. These astronomical assertions belong to his historical illustration. At III.2.8, sunlight's continuing attachment to its source while filling what lies below further illustrates soul's simultaneous relation to higher and lower realities.
Shadow emphasizes derivative limitation. God's shadow is explained as being beneath God, not a literal dark substance or an independent evil principle. Soul's vital shadow names life communicated throughout bodily division, not a soul cut into spatial pieces. Both lux and lumen occur in the related accounts, without a rigid distinction established by these passages. Their meaning, like that of vision and shadow, must be determined from the explanatory relation at issue.
The Proem’s sunlight analogy makes knowing dependent on divine illumination; purification prepares reception. The Magi’s riddle then distinguishes an entirely luminous thing, an entirely obscure thing and a mixed middle. Ficino supplies both a bodily mapping, star/air/moon, and a spiritual one, mind/irrational soul/rational soul. The rational soul’s changing reception is compared with the moon’s changing figure, whereas the angel always shines fully in the same manner with its sun’s light. At the final ascent, the “light seeing itself” phrase deliberately cancels the separation of organ and light that characterized created mind. These are different uses within one developing argument.
Further passage references. Proem.1–Proem.4234; I.1.2, I.1.6; I.2.5, I.2.13; I.5.14; I.6.7–I.6.13234567; II.2.5–62; II.6.11–14234; II.6.24; II.7.31; II.9.13; II.10.11–122; II.11.30; III.1.12, 17–19, 31–32; III.2.8, 19.
Proem.1–22. Illumination and purification establish the programme I.1.6. Mind’s purified gaze is directed toward the divine sun I.5.14. The riddle receives bodily and spiritual interpretations I.6.12. Divine self-seeing exceeds the eye’s reception of another’s light
Places to read
- I.6.12Light seeing itself and sight shining express divine self-knowledge without a separate organ
- II.6.11Visible diffusion illustrates invisible presence, while absence emphasizes dependence
- II.6.24Distinct candlelights model the authorities’ account of minds without confusion
- II.7.31Colored windows model differentiated effects through intermediaries
- II.10.12One-colored light imagined as every-colored illustrates an inexhaustible source
Translation in this edition
Keep the optical examples distinct: visible light’s spread, imagined divine rays, candlelight co-presence, and colored-window differentiation explain different relations. The II.6.14–24234567891011 candle theory remains attributed. At II.10.12 “so to speak” qualifies the description of light as unicolor.
“Changes its form” in the moon analogy renders mutatque figuram and concerns the figure of reception in the comparison; it should not casually become a change in the rational soul’s substantial essence. The cosmological descriptions are Ficino’s model, not contemporary astronomy.
acies / oculus mentis
acies / oculus mentis. Printed forms: mentis aciem; mentis oculo.
The directed gaze or eye of mind. The mind receives and desires truth’s light but is not the divine sun toward which Plato directs it. References: I.1.6. See Light and illumination.
beneficium
beneficium. Printed forms: beneficio.
A benefit, aid, or advantage; beneficio can mean with the help of or by virtue of. The discussion of visibility contrasts abundant light with bodily thickness. Airy and fiery beings lack either means of appearing to earthly eyes in the reported account; the noun is not an inflection of the adverb bene. References: IV.1.38. See Light and illumination.
cernere / respicere
cernere / respicere. Printed forms: cernere; respiciunt.
To discern or turn one’s attention toward. Minds fail to look toward their own light in the exhortation, while the proposed demonstration aims to make them discern immortality; seeing is cognitive in these objects. References: I.1.2, I.1.3. See Light and illumination.
color / lumen
color / lumen. Printed forms: color; lumenque; luminis.
Colour and light. Their sensible efficacy mediates judgement of bodily quantity; the terms here are used in a perceptual example, not only in divine illumination imagery. References: I.2.13. See Light and illumination.
eclipsis / nox / momentum
eclipsis / nox / momentum. Printed forms: eclipsim; momenta; momento; momentum; noctem.
Eclipse, night, and moment or instant. Brief lack of sunlight illustrates a stronger dependence on being; temporal moments also enter the eternity analogy. References: II.6.11, II.6.17, II.7.18. See Light and illumination.
ignis / sol / caelum / stella
ignis / sol / caelum / stella. Printed forms: caeli; caelo; ignis; ignito; solis; stellas.
Fire, sun, heaven, and stars as natural examples. Kindled wood shows a particular cause present to its effect; sunlight and many stars illustrate different cognitive and causal relations. References: II.6.2, II.6.11, II.6.23, II.9.21. See Light and illumination.
illuminare / fulgere / radius / accendere
illuminare / fulgere / radius / accendere. Printed forms: accendantur; fulget; illuminando; illuminat; radiis.
To illuminate, shine, or light a source; rays as an optical image. Divine rays must not be mistaken for dimensional lines, while candlelights model distinct sources sharing a field. References: II.6.13, II.6.14, II.6.24, II.8.4. See Light and illumination.
infusio / infundere
infusio / infundere. Printed forms: infundit; Infusio.
Influx or imparting / pour into. Higher activity is described as stable and immediate, while a receiver’s nature explains successive results. References: III.1.31, III.1.32. See Light and illumination.
lucidus / obscurus
lucidus / obscurus. Printed forms: lucida; obscura; obscurus.
Luminous or clear, and dark or obscure. The Magi’s riddle is mapped first onto stars, air and moon, then mind, irrational soul and rational soul; the mapping is Ficino’s interpretation. References: I.5.14. See Light and illumination.
luna / sol / stella
luna / sol / stella. Printed forms: luna; sole; stella.
Moon, sun and star. Changing lunar reception models rational soul, while uniformly shining stars model angels; these are cosmological analogies of intellectual reception. References: I.5.14. See Light and illumination.
lux / lumen
lux / lumen. Printed forms: luceat; luces; lumen; lumine; lux; Lux.
Light, sensible in examples and intelligible or divine by analogy. Pure light, diffused light, colored radiance, and self-knowing light illustrate different relations and should not be merged. References: II.2.5, II.6.11, II.7.31, II.10.12. See Light and illumination.
lux / lumen / illuminare
lux / lumen / illuminare. Printed forms: illustratur; lumen; luminis.
Light / radiance / illuminate. Angelic intelligence is described as received illumination, and differing reception of light models psychic succession. References: III.1.12, III.1.32. See Light and illumination.
lux se ipsa videns
lux se ipsa videns. Printed forms: lux se ipsa videns; visus se ipso lucens.
Light seeing itself and sight shining by itself. The reciprocity deliberately exceeds the created eye/light distinction; it does not describe an additional physical organ of divine sight. References: I.6.12. See Light and illumination.
viridis / rubens
viridis / rubens. Printed forms: rubens; viridis.
Green / red. Colored light illustrates light qualified by something further; the example explains restricted actuality rather than purity as moral worth. References: III.1.10. See Light and illumination.
Magi (authorities and cited works)
Magi. Authorities for the light riddle, natural powers, and the triad Oromasis–Mitris–Arimanis. Their appearances belong to Ficino's presentation of ancient theology. I.5.14; IV.1.20; IV.1.86. See Hermetic theologians and the Magi; Light and illumination.
Hymns to Apollo and Saturn (authorities and cited works)
Hymns to Apollo and Saturn. The hymnic references contribute images of universal harmony and divine presence. II.6.11; II.9.22. See Light and illumination; Order and harmony.