Leibniz never married; he had considered it at the age of fifty; but the person he had in mind asked for time to reflect. This gave Leibniz time to reflect, too, and so he never married.

A philospher sees the Earth as a large planet, travelling through the heavens, covered with fools

A true philosopher is like an elephant; he never puts the second foot down until the first one is solidly in place.

If I held all the thoughts of the world in my hand, I would be careful not to open it.

A work of morality, politics, criticism will be more elegant, other things being equal, if it is shaped by the hand of geometry.

Since the princes take the Earth for their own, it's fair that the philosophers reserve the sky for themselves and rule there, but they should never permit the entry of others.

I have lived one hundred years; and I die with the consolation of never having thrown the slightest ridicule upon the smallest virtue.