Thus it is clearly seen that use, rather than reason, has power to introduce new things amongst us, and to do away with old things.—Castiglione, Il libro del Cortegiano, I, § 1.
That monster, custom, who all sense doth eat, Of habits devil, is angel yet in this, That to the use of actions fair and good He likewise gives a frock or livery, That aptly is put on.—Hamlet, III, 4.
What custom wills, in all things should we do't.
Coriolanus, II, 3.