In reality, moral rules are directions for running the human machine. Every moral rule is there to prevent a breakdown, or a strain, or a friction, in the running of that machine. That is why these rules at first seem to be constantly interfering with our natural inclinations.
-C.S Lewis, Mere Christianity (69).
C.S Lewis describes the human as "the human machine" in an attempt to illustrate the way morals help guide the human, even if they seem to contradict our "natural inclinations". But why when he invokes the human, does he also invoke