No tree, it is said, can grow to heaven unless its roots reach down to hell.

Our heart glows, and secret unrest gnaws at the root of our being. Dealing with the unconscious has become a question of life for us.

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.

I have frequently seen people become neurotic when they content themselves with inadequate or wrong answers to the questions of life.

But we must not forget that only a very few people are artists in life; that the art of life is the most distinguished and rarest of all the arts.

Hitler's movement is near to Mohammedanism.

Nature has no use for the plea that one 'did not know'.