The following was a chapter of a radio series by Christian apologist C. S. Lewis, that was later compiled into the book Mere Christianity. It has had profound affect upon how I have practiced daily discipleship. - Dan
What is the good of pretending to be what you are not?
Well, even on the human level, you know, there are two kinds of pretending. There is a bad kind, where the pretence is there instead of the real thing; as when a man pretends he is going to help you instead of really helping you. But there is also a good kind, where the pretence leads up to the real thing. When you are not feeling particularly friendly but know you ought to be, the best thing you can do, very often, is to put on a friendly manner and behave as if you were a nicer person than you actually are. And in a few minutes, as we have all noticed, you will be really feeling friendlier than you were. Very often the only way to get a quality in reality is to start behaving as if you had it already.
That is why children's games are so important. They are always pretending to be grown-ups-playing soldiers, playing shop. But all the time, they are hardening their muscles and sharpening their wits, so that the pretence of being grown-up helps them to grow up in earnest.
Now, the moment you realise "Here I am, dressing up as Christ," it is extremely likely that you will see at once some way in which at that very moment the pretence could be made less of a pretence and more of a reality. You will find several things going on in your mind which would not be going on there if you were really a son of God. Well, stop them. Or you may realise that, instead of saying your prayers, you ought to be downstairs writing a letter, or helping your wife to wash-up. Well, go and do it. 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 (specially 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.