Wait, shouldn't I know this already?

I found the following passage very encouraging/convicting. It's an excerpt from Martin-Lloyd Jones's book, Spiritual Depression: it's causes and cure. D. Martin-Lloyd Jones is the man. Or a man. But he's a wise one for a sure.

"Do not think in terms of bargains and rights in the kingdom of God. That is absolutely fatal. There is nothing so wrong as the spirit which argues because I do this, or because I have done that, I have a right to expecting something because I have done that, I have a right to expect something else in return. This is met with frequently. I know very good evangelical people, who seem to be thinking like that. 'Now,' they say, 'if we pray for certain things, we are bound to have them, for instance if we pray all night for revival we must have revival.' I have sometimes described this as the 'penny in the slot' idea of Christianity. You put in your coin and you draw out a bar of chocolate or whatever else you want...

...but that surely is to deny the whole principle which our LORD is teaching. I do not care what it is, whether prayer or anything else, in no respect must I ever argue that because I do something I am entitled to get something--never. And of course the principle can be seen to be true in practice...

...Let us get rid of this bargaining spirit, that if I do this then that will happen... The Holy Spirit is LORD, and He is a sovereign LORD. He sends these things in His own time and His own way. In other words we must realize that we have no right to do anything at all...even rewards are of grace. He need not give them, and if you think you can determine and predict how they are to come you will be quite wrong. Everything is of grace in the Christian life from the very beginning to the very end. To think in terms of bargains and to murmur at results, implies a distrust of Him, and we need to watch our own spirits lest we harbour the thought that He is not dealing with us justly and fairly.

If you start in that way you end by robbing yourself. I like the way in which our LORD teaches that. If you strike a bargain with God, well then it is almost certain that you will just get your bargain and no more...O Christian friends, do not make bargains with God. If you do, you will get only your bargain; but if you leave it to His grace, you will probably get more than you ever thought of. Of the Pharisees our LORD says: 'Verily they have seen their reward.' They do these things in order to be seen of men; they are seen of men, that is what they wanted and that is all they will get, they will get no more..."