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

Hilbert once had a student in mathematics who stopped coming to his lectures, and he was finally told the young man had gone off to become a poet. Hilbert is reported to have remarked: 'I never thought he had enough imagination to be a mathematician.'

Mathematics is being lazy. Mathematics is letting the principles do the work for you so that you do not have to do the work for yourself

The open secret of real success is to throw your whole personality into your problem.

One of the first and foremost duties of the teacher is not to give his students the impression that mathematical problems have little connection with each other, and no connection at all with anything else. We have a natural opportunity to investigate the connections of a problem when looking back at its solution.

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

There exist a lot of questions that the fools can ask, and the intelligent cannot answer.