Each generation has its few great mathematicians, and mathematics would not even notice the absence of the others. They are useful as teachers, and their research harms no one, but it is of no importance at all. A mathematician is great or he is nothing.

To all those who walk the path of human cooperation war must appear loathsome and inhuman.

Every neurotic is partly in the right.

The chief danger in life is that you may take too many precautions.

The only normal people are the ones you don't know very well.

We must never neglect the patient's own use of his symptoms.

All failures - neurotics, psychotics, criminals, drunkards, problem children, suicides, perverts, and prostitutes - are failures because they are lacking in social interest