Perhaps the most often quoted passage from C. S. Lewis comes from Mere Christianity. It has to do with the nature of Christ. It requires no further commentary, so I print it in full here for your consideration:
Jesus . . . told people that their sins were forgiven. . . . This makes sense only if He really was the God whose laws are broken and whose love is wounded in every sin.
. . . I am trying here to prevent anyone saying the really foolish thing that people often say about Him: “I’m ready to accept Jesus as a great moral teacher, but I don’t accept His claim to be God.” That is the one thing we must not say.
A man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic—on a level with the man who says he is a poached egg—or else he would be the Devil of Hell.
You can shut Him up for a fool, you can spit at Him and kill Him as a demon; or you can fall at His feet and call Him Lord and God. But let us not come with any patronising nonsense about His being a great human teacher. He has not left that open to us. He did not intend to.