“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.

When we say something about something, we make it lie there before us, which means at the same time to make it appear.

It is not without cause that men feel the burden of their existence, though they are themselves the cause of those burdens.

Circumstance does not make the man; it reveals him to himself.

A man’s worldly success will be in the measure that he sacrifices his confused animal thoughts.

How should the new day arrive, if the night is withheld from it and everything is suppressed into the twilight of decisionlessness?

There is no good in anything until it is finished.

Just as God gave different fingers to the hand so has He given different ways to men.

There is no value in anything until it is finished.