One of the chief duties of the mathematician in acting as an advisor ... is to discourage ... from expecting too much from mathematics.

Am I really a good mathematician?

There are fields of scientific work...which have been explored from the different sides of pure mathematics, statistics, electrical engineering, and neurophysiology...in which every single notion receives a separate and different name from each group, and in which important work has been triplicated or quadruplicated, while still other important work is delayed by the unavailability in one field of results that may have already become classical in the next field.

There is one quality more important than know-how.... This is know-how by which we determine not only how to accomplish our purposes, but what our purposes are to be.

I have said that the modern man, and especially the modern American, however much 'know-how' he may have, has very little 'know-what'

The best material model of a cat is another, or preferably the same, cat.

The modern physicist is a quantum theorist on Monday, Wednesday, and Friday, and a student of gravitational relativity on Tuesday, Thursday, and Saturday. On Sunday, he is praying... that someone will find the reconciliation between the two views.