The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' (I found it!) but 'That's funny...'

We live, as we dream ... alone.

Physics is not a religion. If it were, we'd have a much easier time raising money.

There is nothing so absurd but some philosopher has said it.

The main things which seem to me important on their own account, and not merely as means to other things, are knowledge, art, instinctive happiness, and relations of friendship or affection.

There's nothing I like less than bad arguments for a view that I hold dear.

Need is considered the cause why something came to be; but in truth it is often merely an effect of what has come to be.

The idea that all ideas are partly true, partly false, and partly meaningless is partly true, partly false and partly meaningless.

A mathematician may say anything he pleases, but a physicists must be at least partially sane.

Half of what I say is meaningless; but I say it so that the other half may reach you.