Henri Poincaré

The most important facts are those which are most general.

It is often said that experiments should be made without a preconceived idea. That is impossible.

The mathematician's work is a game of hide-and-seek with nature.

The physicist, like the poet, is a seeker after truth.

A collection of facts is no more a science than a pile of bricks is a house.

There is no such thing as a problem that cannot be solved.

The more general a truth, the more beautiful it is.

It is not enough to know, one must also apply; it is not enough to will, one must also do.

The scientist is not a man who knows everything, but a man who knows how to find out.

The scientist is not a man who knows everything, but a man who knows how to learn.

The true value of a problem is not in its solution, but in the effort it takes to solve it.

There are no solved problems, only problems that have been abandoned.

The mathematician is a blind man in a dark room looking for a black cat which isn't there.

The scientist is a man who knows how to ask questions.

The most important tool of the mathematician is his imagination.

The true scientist is a man who is always learning.

Science is built up of facts, as a house is built of stones; but a pile of stones is not a house, and a collection of facts is not necessarily science.

The aim of science is not to open the door to infinite wisdom, but to set a limit to infinite error.

Mathematics is the art of reducing any problem to a simpler one.

The scientist is not a man who knows everything, but a man who knows how to find out what he needs to know.