Henri Poincaré

Logic is the hygiene of thought.

The world is a chessboard on which God plays.

Discovery consists of seeing what everybody has seen and thinking what nobody has thought.

Mathematics takes us into the land of the infinite.

The true method of discovery is by the creation of concepts.

In science, we must be prepared to abandon our hypotheses.

The soul of mathematics is freedom.

Humor is the great thing, the saving thing.

The laws of probability are the laws of ignorance.

To create is to choose.

The eye cannot see what the mind does not know.

Wisdom is the reward you get for a lifetime of listening when you'd have preferred to talk.

The topology of space is not determined by its metric.

In the end, we will remember not the words of our enemies, but the silence of our friends.

The function of education is to teach one to think intensively and critically.

Mathematics is logic with the tears wiped away.

The infinite is the possible.

Science is the search for truth.

Life is a succession of lessons which must be lived to be understood.

The art of doing mathematics is to find analogies.