A long-term marriage has to move beyond chemistry to compatibility, to friendship, to companionship. It is certainly not that passion disappears, but that it is conjoined with other ways of love.

The deeper and richer a personality is, the more full it is of paradox and contradiction. It is only a shallow character who offers us no problems of contrast.

Inspiration does not always precede the act of writing; it often follows it.

The world of science lives fairly comfortably with paradox. We know that light is a wave, and also that light is a particle. The discoveries made in the infinitely small world of particle physics indicate randomness and chance, and I do not find it any more difficult to live with the paradox of a universe of randomness and chance and a universe of pattern and purpose than I do with light as a wave and light as a particle. Living with contradiction is nothing new to the human being.

It does not matter that we cannot fathom this mystery. The only real problem comes when we think that we have.

We do not have to understand in order to believe that behind the mystery and the fascination there is love.

... nothing loved is ever lost or perished.