Something deeply hidden had to be behind things.

Ethical axioms are found and tested not very differently from the axioms of science. Truth is what stands the test of experience.

There is no salvation for civilization, or even the human race, other than the creation of a world government.

Playfullness is the essential feature of productive thought.

The most beautiful gift of nature is that it gives one pleasure to look around and try to comprehend what we see.

Live life to the fullest. You have to color outside the lines once in a while if you want to make your life a masterpiece. Laugh some every day. Keep growing, keep dreaming, keep following your heart. The important thing is not to stop questioning.

Often in evolutionary processes a species must adapt to new conditions in order to survive. Today the atomic bomb has altered profoundly the nature of the world as we know it, and the human race consequently finds itself in a new habitat to which it must adapt its thinking.