The mathematical life of a mathematician is short. Work rarely improves after the age of twenty-five or thirty. If little has been accomplished by then, little will ever be accomplished.
The only normal people are the ones you don't know very well.
Exaggerated sensitiveness is an expression of the feeling of inferiority.
My psychology belongs to everyone.
We must never neglect the patient's own use of his symptoms.
A simple rule in dealing with those who are hard to get along with is to remember that this person is striving to assert his superiority; and you must deal with him from that point of view.