In the essay “Rejoinder to Dr. Pittenger”, found in the posthumous collection God in the Dock, C.S. Lewis responds to the criticism that he does not ‘care much for’ the Sermon on the Mount but prefers the Pauline ethic, ht BT:

“As to ‘caring for’ the Sermon on the Mount… Who can like being knocked flat on his face by a sledge-hammer? I can hardly imagine a more deadly spiritual condition than that of the man who can read that passage with tranquil pleasure.”