Hitler's movement is near to Mohammedanism.

The mind has grown to its present state of consciousness as an acorn grows into an oak, or as saurians developed into mammals.

An old man who cannot bid farewell to life appears as feeble and sickly as the young man who is unable to embrace it.

We want to have certainties and no doubts- results and no experiments- without even seeing that certainties can arise only through doubt and results only thorough experiment.

Space flights are merely an escape, a fleeing away from oneself, because it is easier to go to Mars or to the moon than it is to penetrate one's own being.

Man needs difficulties; they are necessary for health.

Since psyche and matter are contained in one and the same world, and moreover are in continuous contact with one another and ultimately rest on irrepresentable, transcendental factors, it is not only possible but fairly probable, even, that psyche and matter are two different aspects of the same thing.