Everything that exists in your life, does so because of two things: something you did or something you didn't do.

My opinion about Miller's experiments is the following. ... Should the positive result be confirmed, then the special theory of relativity and with it the general theory of relativity, in its current form, would be invalid. Experimentum summus judex. Only the equivalence of inertia and gravitation would remain, however, they would have to lead to a significantly different theory.

For me a simple message, to think and act with courage, independence and imagination.

The distinction between the past, present and future is only a stubbornly persistent illusion.

I never teach my pupils, I only attempt to provide the conditions in which they can learn.

Only world law can assure progress towards a civilized peaceful community.

There is, fortunately, a minority composed of those who recognize early in their lives that the most beautiful and satisfying experiences open to humankind are not derived from the outside, but are bound up with the development of the individual's own feeling, thinking and acting. The genuine artists, investigators and thinkers have always been persons of this kind. However inconspicuously the life of these individuals runs its course, none the less the fruits of their endeavors are the most valuable contributions which one generation can make to its successors.