I believe there's no proverb but what is true; they are all so many sentences and maxims drawn from experience, the universal mother of sciences.

He that will not when he may, When he would, he should have nay.

Ill-luck, you know, seldom comes alone.

Miracle me no miracles.

Wine taken in moderation never does any harm.

Sancho Panza by name is my own self, if I was not changed in my cradle.

Nor has his death the world deceiv'd than his wondrous life surprise d; if he like a madman liv'd least he like a wise one dy'd.