Talent without genius isn't much, but genius without talent is nothing whatsoever.

In the physical world, one cannot increase the size or quantity of anything without changing its quality. Similar figures exist only in pure geometry.

It is a law of nature that we defend ourselves from one affection only by means of another.

The universe is built on a plan the profound symmetry of which is somehow present in the inner structure of our intellect.

Fidelity to meaning alone in translation is a kind of betrayal.

A great man is one who leaves others at a loss after he is gone.

Order always weighs on the individual. Disorder makes him wish for the police or for death. These are two extreme circumstances in which human nature is not at ease.