Nothing is more dangerous to one's own faith than the work of an apologist. No doctrine of that faith seems to me so spectral, so unreal as one that I have just successfully defended in a public debate.
The C. S. Lewis Signature Classics (8-Volume Box Set): An Anthology of 8 C. S. Lewis Titles: Mere Christianity, The Screwtape Letters, Miracles, The ... The Abolition of Man, and The Four Loves