Every kind of science, if it has only reached a certain degree of maturity, automatically becomes a part of mathematics. Axiomatic Thought (1918)
The art of doing mathematics consists in finding that special case which contains all the germs of generality.
Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country. Mathematical Circles Revisited (1971)
The Infinite! No other question has ever moved so profoundly the spirit of man; no other idea has so fruitfully stimulated his intellect; yet no other concept stands in greater need of clarification than that of the infinite.
When we turn to the question, what is the essence of the infinite, we must first give ourselves an account as to the meaning the infinite has for reality: let us then see what physics teaches us about it.