Time has no independent existence apart from the order of events by which we measure it.

The series of integers is obviously an invention of the human mind, a self-created tool which simplifies the ordering of certain sensory experiences.

I have lived to prove Thoreau's contention that a man is rich in proportion to the number of things which he can afford to let alone.

We are here for the sake of others

There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle. The most beautiful thing we can experience is the mysterious. It is the source of all true art and all science. He to whom this emotion is a stranger, who can no longer pause to wonder and stand rapt is awe, is as good as dead: his eyes are closed.

Nothing happens unless something moves.

It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.