Science is a collection of successful recipes.

To enter into your own mind you need to be armed to the teeth.

Man cannot bear his own portrait. The image of his limits and his own determinacy exasperates him, drives him mad.

The purpose of psychology is to give us a completely different idea of the things we know best.

A man is a poet if difficulties inherent in his art provide him with ideas; he is not a poet if they deprive him of ideas.

The world acquires value only through its extremes and endures only through moderation; extremists make the world great, the moderates give it stability.

The universe is built on a plan the profound symmetry of which is somehow present in the inner structure of our intellect.