While you live, while it is in your power, be good.
To them that ask: Where hast thou seen the Gods, or how knowest thou certainly that there be Gods, that thou art so devout in their worship? I answer: Neither have I seen my own soul, and yet I respect and honor it.
Remind oneself continually of one of those who practiced virtue in days gone by.
Don't go on discussing what a good person should be. Just be one.
To live happily is an inward power of the soul.
...the sole thing of which any man can be deprived is the present; since this is all he owns, and nobody can lose what is not his.