"All species of the same genus form a natural group, and all genera of the same order form a natural group."

"If you do not know the names of things, the knowledge of them is lost, too."

"I demand of you, and of the whole world, that you show me a generic character... by which to distinguish between Man and Ape. I myself most assuredly know of none. But perhaps I should still do it acc…"

"Nature has always been my school, and my teachers have been the trees, the flowers, and the stones."

"The first step in wisdom is to know the things themselves."