No gains without pains.

If we are industrious, we shall never starve; for, at the workingman's house hunger looks in, but dares not enter. Nor will the bailiff or the constable enter, for industry pays debts, while despair increaseth them.

I say it is impossible that so sensible a people [citizens of Paris], under such circumstances, should have lived so long by the smoky, unwholesome, and enormously expensive light of candles, if they had really known that they might have had as much pure light of the sun for nothing.

Marry your son when you will, but you daughter when you can.

That which hurts, also instructs.

There are three things extremely hard: steel, a diamond, and to know one's self.

Some volumes against Deism fell into my hands ... they produced an effect precisely the reverse to what was intended by the writers; for the arguments of the Deists, which were cited in order to be refuted, appeared to me much more forcibly than the refutation itself; in a word, I soon became a thorough Deist.