What difference does all this theology make? It can start making a difference tonight. If you are interested enough to have read thus far you are probably interested enough to make a shot at saying your prayers: and, whatever else you say, you will probably say the Lord’s Prayer.
Its very first words are Our Father. Do you now see what those words mean? They mean quite frankly, that you are putting yourself in the place of a son of God. To put it bluntly, you are dressing up as Christ. If you like, you are pretending. Because, of course, the moment you realise what the words mean, you realise that you are not a son of God. You are not a being like The Son of God, whose will and interests are at one with those of the Father: you are a bundle of self-centred fears, hopes, greeds, jealousies, and self-conceit, all doomed to death. So that, in a way, this dressing up as Christ is a piece of outrageous cheek. But the odd thing is that He has ordered us to do it.
Why? 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 grownups—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 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.
C.S. Lewis, Mere Christianity (1952; Harper Collins: 2001) 187-189.