Custom is second nature.
Saint Augustine
The best interpreter of the law is custom.
Marcus Tullius Cicero
Nothing is more powerful than custom or habit.
Ovid
Laws are subordinate to custom.
Plautus
Custom adapts itself to expediency.
Tacitus
Custom reconciles us to everything.
Edmund Burke
The way of the world is to make laws, but follow custom.
Michel de Montaigne