“Pure mathematics is in its way the poetry of logical ideas.”

“The formulation of the problem is often more essential than its solution, which may be merely a matter of mathematical or experimental skill.”

“The only sure way to avoid making mistakes is to have no new ideas.”

“It is my view that the vegetarian manner of living, by its purely physical effect on the human temperament, would most beneficially influence the lot of mankind.”

“As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.”

“Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.”

“Logic will get you from A to Z; imagination will get you everywhere.”