The essence of man is imperfection.

History is an accumulation of error.

The purpose of education is to enable us to develop to the fullest that which is inside us

Intelligence and the spirit of adventure can be combined to create new energies, and out of these energies may come exciting and rewarding new prospects.

The growth of the human mind is still high adventure, in many ways the highest adventure on earth.

Pain is part of the body's magic. It is the way the body transmits a sign to the brain that something is wrong.

The starting point for a better world is the belief that it is possible.