"[A] brilliant man is his own best company, unless he can find other company of the same sort. In the society of the u…"

"Thus the diverse states of the soul are always correlative with those of the body."

"One needs only eyes to see the necessary influence of old age on reason."

"The mind, like the body, has its contagious diseases and its scurvy. ...[W]e catch everything from those with whom we…"

"[W]e disdain, ungrateful wretches that we are, this common mother of all kingdoms... We imagine, or rather we infer, …"

"I should prefer an intelligent man without an education, if he were still young enough, to a man badly educated. A ba…"

"The human body is a machine which winds its own springs. It is the living image of perpetual movement. Without food, …"

"One is sometimes inclined to say that the soul is situated in the stomach, and that Van Helmont, who said that the se…"

"The soul follows the progress of the body, as it does the progress of education."

"In general, the form and the structure of the brains of quadrupeds are almost the same as those of the brain of man..…"