Creativity is contagious. Pass it on.

It is impossible to get out of a problem by using the same kind of thinking that it took to get into it.

The world we have created is a product of our thinking.

Whatever your problems in math are, I assure mine are greater.

To me the worst thing seems to be a school principally to work with methods of fear, force and artificial authority. Such treatment destroys the sound sentiments, the sincerity and the self-confidence of pupils and produces a subservient subject.

A theory is the more impressive the greater is the simplicity of its premises, the more different are the kinds of things it relates and the more extended the range of its applicability.

Nature conceals her secrets because she is sublime, not because she is a trickster.