The most fundamental question we can ever ask ourselves is whether or not the universe we live in is friendly or hostile.

The ideas that have lighted my way have been kindness, beauty and truth.

Each of us visits this Earth involuntarily, and without an invitation. For me, it is enough to wonder at the secrets.

A mathematical equation stands forever.

Even on the most solemn occasions I got away without wearing socks and hid that lack of civilization in high boots

The most important method of education always has consisted of that in which the pupil was urged to actual performance.

Body and soul are not two different things, but only two different ways of perceiving the same thing. Similarly, physics and psychology are only different attempts to link our experiences together by way of systematic thought.