You won't find a more apt example of an excerpt that is contradictory to an author's broader writings than this bit from C.S. Lewis' Mere Christianity:
Before leaving the question of divorce, I should like to distinguish two things which are very often confused. The Christian conception of marriage is one: the other is quite the different question—how far Christians, if they are voters or Members of Parliament, ought to try to force their views of marriage on the rest of the community by embodying them in the divorce laws. A great many people seem to think that if you are a Christian yourself you should try to make divorce difficult for every one. I do not think that. At least I know I should be very angry if the Mohammedans tried to prevent the rest of us from drinking wine. My own view is that the Churches should frankly recognize that the majority of the British people are not Christian and, therefore, cannot be expected to live Christian lives. There ought to be two distinct kinds of marriage: one governed by the State with rules enforced on all citizens, the other governed by the church with rules enforced by her on her own members. The distinction ought to be quite sharp, so that a man knows which couples are married in a Christian sense and which are not.
This argument provoked a strong response from Lewis' friend and fellow Inkling, J.R.R. Tolkien. Tolkien drafted a response to Lewis sometime in 1943 but never sent it. After Tolkien died, the letter was found folded up inside his copy of Lewis' "Christian Behavior,"which would be republished as part of Mere Christianity. (I've added the emphasis.)
My dear L.,
I have been reading your booklet 'Christian Behavior." ...1
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