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.
From Mere Christianity by C S Lewis