If I err in belief that the souls of men are immortal, I gladly err, nor do I wish this error which gives me pleasure to be wrested from me while I live.

There is, I assure you, a medical art for the soul. It is philosophy, whose aid need not be sought, as in bodily diseases, from outside ourselves. We must endeavor with all our resources and all our strength to become capable of doctoring ourselves.

The eyes like sentinel occupy the highest place in the body.

As I give thought to the matter, I find four causes for the apparent misery of old age; first it withdraws us from active accomplishments; second, it renders the body less powerful; third, it deprives us of almost all forms of enjoyment; fourth, it stands not far from death.

Cultivation of the mind is as necessary as food to the body.

Those wars are unjust which are undertaken without provocation. For only a war waged for revenge or defense can be just.