The following is from Mere Christianity. If you haven’t read the book, I would encourage you to do so.
Pride is the killer of all things that God wants to do in and through us. It is very deceptive and is the one fleshly vice that can appear and feel righteous because in a christian it makes morality king… not Jesus. I hope this challenges you as much as it did me.
The Christians are right: it is Pride which has been the chief cause of misery in every nation and every family since the world began. Other vices may sometimes bring people together: you may find good fellowship and jokes and friendliness among drunken people or unchaste people. But Pride always means enmity-it is enmity. And not only enmity between man and man, but enmity to God.
In God you come up against something which is in every respect immeasurably superior to yourself. Unless you know God as that-and, therefore, know yourself as nothing in comparison- you do not know God at all. As long as you are proud you cannot know God. A proud man is always looking down on things and people: and, of course, as long as you are looking down, you cannot see something that is above you.
That raises a terrible question. How is it that people who are quite obviously eaten up with Pride can say they believe in God and appear to themselves very religious? I am afraid it means they are worshiping an imaginary God. They theoretically admit themselves to be nothing in the presence of this phantom God, but are really all the time imagining how He approves of them and thinks them far better than ordinary people: that is, they pay a pennyworth of imaginary humility to Him and get out of it a pound’s worth of Pride towards their fellow-men. I suppose it was of those people Christ was thinking when He said that some would preach about Him and cast out devils in His name, only to be told at the end of the world that He had never known them. And any of us may at any moment be in this death-trap.
Luckily, we have a test. Whenever we find that our religious life is making us feel that we are good-above all, that we are better than someone else-I think we may be sure that we are being acted on, not by God, but by the devil. The real test of being in the presence of God is that you either forget about yourself altogether or see yourself as a small, dirty object. It is better to forget about yourself altogether.
It is a terrible thing that the worst of all the vices can smuggle itself into the very center of our religious life. But you can see why. The other, and less bad, vices come from the devil working on us through our animal nature. But this does not come through our animal nature at all It comes direct from Hell. It is purely spiritual: consequently it is far more subtle and deadly. For the same reason, Pride can often be used to beat down the simpler vices. Teachers, in fact, often appeal to a boy’s Pride, or, as they call it, his self-respect, to make him behave decently: many a man has overcome cowardice, or lust, or ill-temper by learning to think that they are beneath his dignity-that is, by Pride. The devil laughs. He is perfectly content to see you becoming chaste and brave and self-controlled provided, all the time, he is setting up in you the Dictatorship of Pride-just as he would be quite content to see your chilblains (similar to frostbite) cured if he was allowed, in return, to give you cancer. For Pride is spiritual cancer: it eats up the very possibility of love, or contentment, or even common sense.