“He who knows how to speak, knows also when.”

Give me but a firm spot on which to stand, and I shall move the earth.

Man has always learned from past. After all, you can’t learn history in reverse.

There are things which seem incredible to most men who have not studied mathematics.

Don’t disturb my circles!

Mathematics reveals its secrets only to those who approach it with pure love, for its own beauty.

Rise above oneself and grasp the world.

Give me a place to stand, and a lever long enough, and I will move the world.

Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.

Those who claim to discover everything but produce no proofs of the same may be confused as having actually pretended to discover the impossible.

Give me a place to stand, and I will move the Earth.

Fellow, stand away from my diagram.

From a Christian point of view, human reason is madness compared to the reason of God, but divine reason appears as madness to human reason.

Maybe the target nowadays is not to discover what we are but to refuse what we are.

For without tragedies there is no life & what is life if not all our tragedies put together?

We seldom speak of what we have but often of what we lack.

When I approach a child he inspires in me two sentiments tenderness for what he is and respect for what he may become.

Man can do what he wills but he cannot will what he wills.

Life can only be understood backward, but it must be lived forwards.

Tied to worldly illusions, our sight is but a painted vision.