The successful development of science requires a proper balance to be maintained between the method of building up from observations and the method of deducing by pure reasoning from speculative assumptions.

The measure of greatness in a scientific idea is the extent to which it stimulates thought and opens up new lines of research.

If one is working from the point of view of getting beauty into one’s equation, … one is on a sure line of progress.

The aim of science is to make difficult things understandable in a simpler way; the aim of poetry is to state simple things in an incomprehensible way. The two are incompatible.