One partner is always more in love than the other.

When man, Apollo man, rockets into space, it isn't in order to find his brother, I'm quite sure of that. It's to confirm that he hasn't any brothers.

A love affair based on jealousy is doomed from the start ... It is certanly a sign of love, but it's a sign that it's already dying.

I've tried very hard and I've never found any resemblance between the people I know and the people in my novels.

For this was the round of love: fear which leads on desire, tenderness and fury, and that brutal anguish which triumphantly follows pleasure.

I don't think there's any intrinsic difference between a lover and a husband. ... If I were cynical, I would say that a woman should have both a good husband and a lover. But I'm not cynical so I'll just say that a woman should have a lover who's a good husband and a husband who's a good lover, perhaps both.

To jealousy, nothing is more frightful than laughter.