An intimate friend and a hated enemy have always been indispensable requirements for my emotional life; I have always been able to create them anew, and not infrequently my childish ideal has been so closely approached that friend and enemy coincided in the same person.

Men are not gentle, friendly creatures wishing for love, who simply defend themselves if they are attacked, but ... a powerful measure of desire for aggression had to be reckoned as part of their instinctual endowment.

In some place in my soul, in a very hidden corner, I am a fanatical Jew. I am very much astonished to discover myself as such in spite of all efforts to be unprejudiced and impartial. What can I do against it at my age?

The game replaces sexual enjoyment by pleasure in movement.

Yes, America is gigantic, but a gigantic mistake.

We should picture the instrument that carries our mental functioning as resembling a compound microscope or photographic apparatus.

In matters of sexuality we are at present, every one of us, ill or well, nothing but hypocrites.