One has no friend who has many friends.

The soul is characterized by these capacities; self-nutrition, sensation, thinking, and movement.

Happiness does not lie in amusement; it would be strange if one were to take trouble and suffer hardship all one's life in order to amuse oneself.

The young are permanently in a state resembling intoxication.

We should venture on the study of every kind of animal without distaste; for each and all will reveal to us something natural and something beautiful.

We are what we repeatedly do.

Aristotle said: "Evil brings men together."