Richard Feynman

Physics is like sex . . . it may give some practical results, but that's not why we do it.

C.S. Lewis, Mere Christianity

The Christian attitude does not mean that there is anything wrong about sexual pleasure, any more than about the pleasure of eating. It means that you must not isolate that pleasure and try to get it by itself, any more than you ought to try to get the pleasures of taste without swallowing and digesting, by chewing things and spitting them out again.

[Book III, Chapter 6, "Christian Marriage"]

C.S. Lewis, Mere Christianity

The sins of the flesh are bad, but they are the least bad of all sins. All the worst pleasures are purely spiritual: the pleasure of putting other people in the wrong, of bossing and patronising and spoiling sport, and back-biting; the pleasures of power, of hatred. For there are two things inside me, competing with the human self which I must try to become. They are the Animal self, and the Diabolical self. The Diabolical self is the worse of the two. That is why a cold, self-righteous prig who goes regularly to church may be far nearer to hell than a prostitute. But, of course, it is better to be neither.

[Book III, Chapter 5, "Sexual Morality"]

Captain Corelli's Mandolin

When you fall in love, it is like temporary madness. It erupts like an earthquake and then it subsides. And when it subsides, you have to make a decision. You have to work out whether your roots have become so entwined together that it is inconceivable that you should ever part. Because this is what love is.
Love is not breathlessness, it is not excitement, it is not the desire to mate every second of the day, it is not lying awake at night imagining that he is kissing every part of your body. . . . That is just being in love, which any of us can convince ourselves we are. Love itself is what is left over when being in love has burned away. It doesn't sound very exciting . . . but it is.

G.K. Chesterton, Orthodoxy

It is true that the historic Church has at once emphasised celibacy and emphasised the family; has at once (if one may put it so) been fiercely for having children and fiercely for not having children. It has kept them side by side like two strong colours, red and white, like the red and white upon the shield of St. George. It has always had a healthy hatred of pink. It hates that combination of two colours which is the feeble expedient of the philosophers. It hates that evolution of black into white which is tantamount to a dirty gray. In fact, the whole theory of the Church on virginity might be symbolized in the statement that white is a colour; not merely the absence of a colour. All that I am urging here can be expressed by saying that Christianity sought in most of these cases to keep two colours coexistent but pure. It is not a mixture like russet or purple; it is rather like a shot silk, for a shot silk is always at right angles, and is in the pattern of the cross.

. . . It is constantly assured, especially in our Tolstoyan tendencies, that when the lion lies down with the lamb the lion becomes lamb-like. But that is brutal annexation and imperialism on the part of the lamb. That is simply the lamb absorbing the lion instead of the lion eating the lamb. The real problem is -- Can the lion lie down with the lamb and still retain his royal ferocity? That is the problem the Church attempted; that is the miracle she achieved.
[Chapter VI, "The Paradoxes of Christianity"]

G.K. Chesterton, Orthodoxy

I could never mix in the common murmur of that rising generation against monogamy, because no restriction on sex seemed so odd and unexpected as sex itself. . . . Keeping to one woman is a small price to pay for so much as seeing one woman. To complain that I could only be married once was like complaining that I had only been born once. It was incommensurate with the terrible excitement of which one was talking. It showed, not an exaggerated sensibility to sex, but a curious insensibility to it. A man is a fool who complains that he cannot enter Eden by five gates at once.
[Chapter IV, "The Ethics of Elfland"]