In poetry everything which must be said is almost impossible to say well.

A man is infinitely more complicated than his thoughts.

Serious people have few ideas. People with ideas are never serious.

Science means simply the aggregate of all the recipes that are always successful. All the rest is literature.

Great things are accomplished by those who do not feel the impotence of man. This is a precious gift.

That which has always been accepted by everyone, everywhere, is almost certain to be false.

An attitude of permanent indignation signifies great mental poverty. Politics compels it votaries to take that line and you can see their minds growing more impoverished every day, from one burst of righteous indignation to the next.