The happiness and unhappiness of the rational, social animal depends not on what he feels but on what he does; just as his virtue and vice consist not in feeling but in doing.

This is moral perfection: to live each day as though it were the last; to be tranquil, sincere, yet not indifferent to one's fate.

In one way an arrow moves, in another way the mind. The mind indeed, both when it exercises caution and when it is employed about inquiry, moves straight onward not the less, and to its object.

The passing minute is every man's equal possession but what has once gone by is not ours.

Turn thy thoughts now to the consideration of thy life, thy life as a child, as a youth, thy manhood, thy old age, for in these also every change was a death. Is this anything to fear?

So much worse are the consequences of anger than its causes.

The body of an actor can be either his best friend or his worst enemy.