The beginner should not be discouraged if he finds he does not have the prerequisites for reading the prerequisites.

Applied mathematics will always need pure mathematics just as anteaters will always need ants.

It is the duty of all teachers, and of teachers of mathematics in particular, to expose their students to problems much more than to facts.

I read once that the true mark of a pro - at anything - is that he understands, loves, and is good at even the drudgery of his profession.

You are allowed to lie a little, but you must never mislead.

Feller was an ebullient man, who would rather be wrong than undecided.

The joy of suddenly learning a former secret and the joy of suddenly discovering a hitherto unknown truth are the same to me - both have the flash of enlightenment, the almost incredibly enhanced vision, and the ecstasy and euphoria of released tension.