The central Christian belief is that Christ's death has somehow put us right with God and given us a fresh start. Theories as to how it did this are another matter. A good many different theories have been held as to how it works; what all Christians are agreed on is that it does work.
C. S. LewisThe very condition of having Friends is that we should want something else besides Friends. Where the truthful answer to the question "Do you see the same truth?" would be "I see nothing and I don't care about the truth; I only want a Friend," no Friendship can arise - though Affection of course may. There would be nothing for the Friendship to be about; and Friendship must be about something, even if it were only an enthusiasm for dominoes or white mice. Those who have nothing can share nothing; those who are going nowhere can have no fellow-travellers.
C. S. LewisWhere men are forbidden to honour a king, they honor millionaires, athletes, or film stars instead; even famous prostitutes or gangsters. For spiritual nature, like bodily nature, will be served; deny it food and it will gobble poison.
C. S. LewisGod cannot give us a happiness and peace apart from Himself, because it is not there. There is no such thing.
C. S. Lewis[S]omething inside us, the feeling of resentment, the feeling that wants to get one's own back, must be simply killed. I do not mean that anyone can decide this moment that he will never feel it anymore. That is not how things happen. I mean that every time it bobs its head up, day after day, year after year, all our lives long, we must hit it on the head. It is hard work, but the attempt is not impossible.
C. S. Lewis