Life is like riding a bicycle. If you want to stay balanced you've got to keep moving forward.

Modern education is competitive, nationalistic and separative. It has trained the child to regard material values as of major importance, to believe that his nation is also of major importance and superior to other nations and peoples. The general level of world information is high but usually biased, influenced by national prejudices, serving to make us citizens of our nation but not of the world.

The daily struggle does not arise from a purpose or a program, but from an immediate need.

I urge a willingness to reserve a place in rational science for non-rational wonder.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

If you want different results, do not do the same things.

When a man is sufficiently motivated, discipline will take care of itself.