I have an infamously low capacity for visualizing relationships, which made the study of geometry and all subjects derived from it impossible for me.

In human beings pure masculinity or femininity is not to be found either in a psychological or biological sense.

We have long observed that every neurosis has the result, and therefore probably the purpose, of forcing the patient out of real life, of alienating him from actuality.

Might we not say that every child at play behaves like a creative writer, in that he creates a world of his own, or, rather, rearranges the things of his world in a new way which pleases him?

What progress we are making. In the Middle Ages they would have burned me. Now they are content with burning my books.

If you can't do it, give up!

It must be pointed out, however, that strictly speaking it is incorrect to talk of the dominance of the pleasure principle over the course of mental processes. If such a dominance existed, the immense majority of our mental processes would have to be accompanied by pleasure or to lead to pleasure, whereas universal experience completely contradicts any such conclusion.