All good thoughts and ideas mean nothing without action.

How little can we foresee the consequences either of wise or unwise action, of virtue or of malice. Without this measureless and perpetual uncertainty, the drama of human life would be destroyed.

Sit as little as possible; give no credence to any thought that was not born outdoors while one moved about freely - in which the muscles are not celebrating a feast, too: all prejudices come from the intestines. The sedentary life - as I have said once before - is the real sin against the holy spirit.

I never worry about action, but only about inaction.

Out of anger comes controversy, out of controversy comes conversation, out of conversation comes action.

Life consists in penetrating the unknown, and fashioning our actions in accord with the new knowledge thus acquired.