Seneca, Letters to Lucilius Letter 39

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.

At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'

Waste no more time arguing what a good man should be. Be one.