Henri Poincaré

Chance is the pseudonym of God when he did not want to sign.

The mind is everything. What you think you become.

In mathematics, you don't understand things. You just get used to them.

The only way to do great work is to love what you do.

Geometry is not true, it is advantageous.

The scientist's first love is the hypothesis.

To invent is to discern, to choose.

The world is full of magic things patiently waiting for our senses to grow sharper.

Mathematics is the gate and key to the sciences.

Doubt is not a pleasant condition, but certainty is absurd.

The beginning of wisdom is the definition of terms.

In the middle of difficulty lies opportunity.

The Lorentz transformation is the key to relativity.

Thought is the sculptor who can create the beautiful.

Science knows no country.

The power of mathematics is often to change one thing into another.

Life is short, art is long.

The hypothesis is the scaffold for the edifice of science.

Intuition makes much of it; I mean the faculty of quickly seeing the truth of a situation.

The joy of life is in the work itself.