Man errs as long as he strives.

First let a man teach himself, and then he will be taught by others.

If I work incessantly to the last, nature owes me another form of existence when the present one collapses.

I hate every violent overthrow, because as much is destroyed as is gained by it.

Daily life is more instructive than the most effective book.

Things which matter most must never be at the mercy of things which matter least.

He who possesses art and science has religion; he who does not possess them, needs religion.