One is very crazy when in love.

There is to my mind no doubt that the concept of beautiful had its roots in sexual excitation and that its original meaning was sexually stimulating.

So in every individual the two trends, one towards personal happiness and the other unity with the rest of humanity, must contend with each other.

I prefer the company of animals more than the company of humans. Certainly, a wild animal is cruel. But to be merciless is the privilege of civilized humans.

Men have gained control over the forces of nature to such an extent that with their help they would have no difficulty exterminating one another to the last man. They know this, and hence comes a large part of their current unrest, their unhappiness and their mood of anxiety.

None believes in his own death. In the unconscious everyone is convinced of his own immortality.

The more the fruits of knowledge become accessible to men, the more widespread is the decline of religious belief.