There are many questions which fools can ask that wise men cannot answer.

Success in solving the problem depends on choosing the right aspect, on attacking the fortress from its accessible side.

What is the difference between method and device? A method is a device which you use twice.

Solving problems is a practical skill like, let us say, swimming. We acquire any practical skill by imitation and practice. Trying to swim, you imitate what other people do with their hands and feet to keep their heads above water, and, finally, you learn to swim by practicing swimming. Trying to solve problems, you have to observe and to imitate what other people do when solving problems, and, finally, you learn to do problems by doing them.

I am too good for philosophy and not good enough for physics. Mathematics is in between.

The first rule of style is to have something to say. The second rule of style is to control yourself when, by chance, you have two things to say; say first one, then the other, not both at the same time.

It may be more important in the mathematics class how you teach than what you teach.