The fox changes his skin but not his habits. — Suetonius (70-126, Roman historian)
Make a Habit of Two Things
Make a habit of two things: to help; or at least to do no harm. — Hippocrates (460-377 BC, Greek physician)
Make It Your Habit
Make it your habit not to be critical about small things. — Edward Everett Hale (1820-1905)
Eudaimonia 