Nature’s limits and the Mercury proverb

Meaning

The visitor qualifies the presence of the Stone in all things with a Mercury-and-wood phrase adapting the proverb that a Mercury cannot be carved from every kind of wood. The point is unequal suitability, not denial of the shared root. The nearby closely set incertis admits two readings in the supplied edition: “uncertain limits,” which its translation follows, or in certis, “within certain limits.” Neither reading licenses unlimited procedure. The textual alternative should remain visible rather than becoming a settled claim about nature’s uncertainty.