The different religions have never overlooked the part played by the sense of guilt in civilization. What is more, they come forward with a claim...to save mankind from this sense of guilt, which they call sin.

Illusions commend themselves to us because they save us pain and allow us to enjoy pleasure instead. We must therefore accept it without complaint when they sometimes collide with a bit of reality against which they are dashed to pieces.

A man's heterosexuality will not put up with any homosexuality, and vice versa.

Intelligence will be used in the service of the neurosis.

Civilization runs a greater risk if we maintain our present attitude to religion than if we give it up.

Only the real, rare, true scientific minds can endure doubt, which is attached to all our knowledge.

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.