As We Become Like Christ: by CS Lewis

For those God foreknew he also predestined to be conformed to the likeness of his Son, that he might be the firstborn among many brothers. Romans 8:29

You see what is happening. The Christ Himself, the Son of God who is man (just like you) and God (just like His Father) is actually at your side and is already at that moment beginning to turn your pretence into a reality. This is not merely a fancy way of saying that your conscience is telling you what to do. If you simply ask your conscience, you get one result; if you remember that you are dressing up as Christ, you get a different one. There are lots of things which your conscience might not call definitely wrong (especially things in your mind) but which you will see at once you cannot go on doing if you are seriously trying to be like Christ. For you are no longer thinking simply about right and wrong; you are trying to catch the good infection from a Person. It is more like painting a portrait than like obeying a set of rules. And the odd thing is that while in one way it is much harder than keeping rules, in another way it is far easier.

The real Son of God is at your side. He is beginning to turn you into the same kind of thing as Himself. He is beginning, so to speak, to 'inject' His kind of life and thought, His Zoe, into you; beginning to turn the tin soldier into a live man. The part of you that does not like it is the part that is still tin.

And now we begin to see what it is that the New Testament is always talking about. It talks about Christians 'being born again'; it talks about them 'putting on Christ'; about Christ 'being formed in us'; about our coming to 'have the mind of Christ'.

Put right out of your head the idea that these are only fancy ways of saying that Christians are to read what Christ said and try to carry it out—as a man may read what Plato or Marx said and try to carry it out. They mean something much more than that. They mean that a real Person, Christ, here and now, in that very room where you are saying your prayers, is doing things to you. It is not a question of a good man who died two thousand years ago. It is a living Man, still as much a man as you, and still as much God as He was when He created the world, really coming and interfering with your very self; killing the old natural self in you and replacing it with the kind of self He has. At first, only for moments. Then for longer periods. Finally, if all goes well, turning you permanently into a different sort of thing; into a new little Christ, a being which, in its own small way, has the same kind of life as God; which shares in His power, joy, knowledge and eternity.