A passage from Diogenes Laertius
Diogenes Laertius, Lives 7.89
✱
They hold that virtue is a harmonious disposition, choice-worthy for its own sake, not from hope or fear.
Related passages
✱
Men seek retreats for themselves, houses in the country, sea-shores, and mountains... But this is altogether a mark of the most common sort of men, for it is in thy power whenever thou shalt choose to retire into thyself.
✱
Take away thy opinion, and then there is taken away the complaint, 'I have been harmed.' Take away the complaint, and the harm is taken away.
✱
At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'