All of these quotes from C.S. Lewis appear in the book Yours, Jack.
“The modern tradition is that the proper reason for marrying is the state described as ‘being in love.’ … Doesn’t the modern emphasis on ‘love’ lead people either into divorce or into misery, because when that emotion dies down they conclude that their marriage is a ‘failure,’ though in fact they have just reached the point at which real marriage begins.”
“There is a terrible comment on this in I Cor VI 16 ‘he that is joined to a harlot is one flesh.’ You see? Apparently, if Christianity is true, the mere fact of sexual intercourse set up between human beings a relation which has, so to speak, transcendent repercussions—some eternal relation is established whether they like it or not.”
“Agape is best seen, I think, in the words ‘love your neighbor as yourself,’ i.e., by an act of will, aim at your neighbor’s good in the same way as you aim at your own. Now you don’t ‘love’ yourself because of your own ‘lovable qualities.’ You may, in moments of vanity, attribute lovable qualities to yourself, but that is not the cause of your self-love but one of the results of it. At other moments, when you dislike yourself, you still wish for your own happiness. This attitude to one’s own self is dictated by nature: towards other selves it has to be acquired.”
“The great thing in friendship as in all other forms of love is, as you know, to turn from the demand to be loved (or helped or answered) to the wish to love (or help or answer).”
“When I have learnt to love God better than my earthly dearest, I shall love my earthly dearest better than I do now. In so far as I learn to love my earthly dearest at the expense of God and instead of God, I shall be moving towards the state in which I shall not love my earthly dearest at all. When first things are put first, second things are not suppressed but increased.”
“I take it that in every marriage natural love sooner or later, in a high or low degree, comes up against difficulties (if only the difficulty that the original state of ‘being in love’ dies a natural death) which forces it either to turn into dislike or else to turn into Christian charity. For all of our natural feelings are, not resting places, but points d’appui, springboards. One has to go on from there, or fall back from there. The merely human pleasure in being loved must either go bad or become the divine joy of loving.”
“It is right and inevitable that we should be much concerned about the salvation of those we love. But we must be careful not to expect or demand that their salvation should conform to some ready-made pattern of our own. … God has His own unique way with each soul.”
“The real trouble about the duty of forgiveness is that you do it with all your might on Monday and then find on Wednesday that it hasn’t stayed put and all has to be done over again.”
You can read my review of Yours, Jack by clicking here. And you can check out some other quotes I shared from this collection of Lewis’ personal correspondence here and here.
Character is forged like steel—with fire and hammering. 
Craig T. Owens 