Life is like riding a bicycle. To keep your balance you must keep moving.

There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.

Not everything that counts can be counted, and not everything that can be counted counts. This was on a sign hanging in Einstein's office at Princeton, which is often quoted as a statement by him; research should be able to reveal whether or not it originated with Einstein.

Only a life lived for others is a life worthwhile.

Nothing will benefit human health and increase chances for survival of life on Earth as much as the evolution to a vegetarian diet.

One of the strongest motives that lead men to art and science is escape from everyday life with its painful crudity and hopeless dreariness, from the fetters of one's own ever-shifting desires. A finely tempered nature longs to escape from the personal life into the world of objective perception and thought.