How often people speak of art and science as though they were two entirely different things, with no interconnection. That is all wrong. The true artist is quite rational as well as imaginative and knows what he is doing; if he does not, his art suffers. The true scientist is quite imaginative as well as rational, and sometimes leaps to solutions where reason can follow only slowly; if he does not, his science suffers.

The day you stop learning is the day you begin decaying.

Rejection slips, or form letters, however tactfully phrased, are lacerations of the soul, if not quite inventions of the devil-but there is no way around them.

Before another century is done it will be hard for people to imagine a time when humanity was confined to one world, and it will seem to them incredible that there was ever anybody who doubted the value of space and wanted to turn his or her back on the Universe.

There is nothing so eternally adhesive as the memory of power.

Life is a journey, but don't worry, you'll find a parking spot at the end.

When I read about the way in which library funds are being cut and cut, I can only think that American society has found one more way to destroy itself.