It saddens me that educated people don't even know that my subject exists.

A good stack of examples, as large as possible, is indispensable for a thorough understanding of any concept,and when I want to learn something new, I make it my first job to build one.

When a student comes and asks, "Should I become a mathematician?" the answer should be no. If you have to ask, you shouldn't even ask.

A smooth lecture... may be pleasant; a good teacher challenges, asks, irritates and maintains high standards - all that is generally not pleasant.

Mathematics is not a deductive science - that's a cliché... What you do is trial and error, experimentation, guesswork.

The author discusses valueless measures in pointless spaces.

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