Push on and faith will catch up with you.

Thus metaphysics and mathematics are, among all the sciences that belong to reason, those in which imagination has the greatest role. I beg pardon of those delicate spirits who are detractors of mathematics for saying this . . . . The imagination in a mathematician who creates makes no less difference than in a poet who invents. . . . Of all the great men of antiquity, Archimedes may be the one who most deserves to be placed beside Homer.

There are only two kinds of certain knowledge: Awareness of our own existence and the truths of mathematics.

In England it was enough that Newton was the greatest mathematican of his century; in France he would have been expected to be agreeable too.

Just go on..and faith will soon return.

I am worn out by the insults and vexations that this work brings down on us.

A philosopher is a fool who torments himself while he is alive, to be talked of after he is dead.