Laying down your arms, surrendering, saying you are sorry, realising that you have been on the wrong track and getting ready to start life over again from the ground floor—that is the only way out of our ‘hole’. This process of surrender—this movement full speed astern—is what Christians call repentance…. If you ask God to take you back without it, you are really asking Him to let you go back without going back. it cannot happen. Very well, then, we must go through with it. But the same badness which makes us need it, makes us unable to do it. Can we do it if God helps us? Yes, but what do we mean when we talk of God helping us? We mean God putting into us a bit of Himself, so to speak. He lends us a little of His reasoning powers and that is how we think: He puts a little of His love into us and that is how we love one another. When you teach a child writing, you hold its hand while it forms the letters: that is, it forms the letters because you are forming them. We love and reason because God loves and reasons and holds our hand while we do it. Now if we had not fallen, that would be all plain sailing. But unfortunately we now need God’s help in order to do something which God, in His own nature, never does at all—to surrender, to suffer, to submit, to die. Nothing in God’s nature corresponds to this process at all. So that the one road for which we now need God’s leadership most of all is a road God, in His own nature, has never walked. God can share only what He has: this thing, in His own nature, He has not.
But supposing God became a man—suppose our human nature which can suffer and die was amalgamated with God’s nature in one person—then that person could help us. He could surrender His will, and suffer and die, because He was man; and He could do it perfectly because He was God. You and I can go through this process only if God does it in us; but God can do it only if He becomes man. Our attempts at this dying will succeed only if we men share in God’s dying, just as our thinking can succeed only because it is a drop out of the ocean of His intelligence: but we cannot share God’s dying unless God dies; and He cannot die except by being a man. That is the sense in which He pays our debt, and suffers for us what He Himself need not suffer at all.
C.S. Lewis, Mere Christianity (1952; Harper Collins: 2001) 56, 57-58.