Imagination is everything. It is the preview of life's coming attractions.

To stimulate creativity one must develop childlike inclination for play and the childlike desire for recognition.

We cannot solve our problems with the same thinking we used when we created them.

The state is made for man, not man for the state.... That is to say, the state should be our servant and not we its slaves

It is intelligent to have a plan, but neurotic to fall in love with it.

I would absolutely refuse any direct or indirect war service and would try to persuade my friends to do the same, regardless of the reasons for the cause of a war.

If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.