If then nature makes nothing without some end in view, nothing to no purpose, it must be that nature has made all of them for the sake of man.

A friend is simply one soul in two bodies.

The knowledge of the soul admittedly contributes greatly to the advance of truth in general, and, above all, to our understanding of Nature, for the soul is in some sense the principle of animal life.

Character is that which reveals moral purpose, exposing the class of things a man chooses and avoids.

Everything that depends on the action of nature is by nature as good as it can be.

Law is mind without reason.

Just as a royal rule, if not a mere name, must exist by virtue of some great personal superiority in the king, so tyranny, which is the worst of governments, is necessarily the farthest removed from a well-constituted form; oligarchy is little better, for it is a long way from aristocracy, and democracy is the most tolerable of the three.