Quantum mechanics, with its leap into statistics, has been a mere palliative for our ignorance

All models divide naturally...into two a priori parts: one is kinematics, whose aim is to parameterize the forms of the states of the process under consideration, and the other is dynamics, describing the evolution in time of these forms.

I believe that proving is not a natural activity for mathematicians.

Topology is precisely the mathematical discipline that allows the passage from local to global.

The importance of the "New Mathematics" lies mainly in the fact that it has taught us the difference between the disc and the circle.

If one must choose between rigour and meaning, I shall unhesitatingly choose the latter.

The world of ideas is not revealed to us in one stroke; we must both permanently and unceasingly recreate it in our consciousness.