"Time is the most valuable thing a man can spend."

"The man of petty ambition if invited to dinner will be eager to be set next his host."

"We must consider the distinctive characters and the general nature of plants from the point of view of their morphology , their behavior under external conditions, their mode of generation, and the whole course of their life."

"One may define flattery as a base companionship which is most advantageous to the flatterer."

"An orator without judgment is a horse without a bridle."

"Ah, yes, superstition: it would appear to be cowardice in face of the supernatural."