ou've probably been exposed to teaching about sanctification suggesting that believers ought to be totally passive in their quest for victory over sin and simply trust God to take the evil desire or temptation out of the way. The idea is that since human effort is fleshly and our efforts are always flawed and imperfect anyway, we should just "let go and let God."
Here's what D. Martyn Lloyd-Jones said about that:
I do not know of a single scriptureand I speak advisedlywhich tells me to take my sin, the particular thing that gets me down, to God in prayer and ask him to deliver me from it and then trust in faith that he will.
Now that teaching is also often put like this: you must say to a man who is constantly defeated by a particular sin, "I think your only hope is to take it to Christ and Christ will take it from you." But what does Scripture say in Ephesians 4:28 to the man who finds himself constantly guilty of stealing, to a man who sees something he likes and takes it? What am I to tell such a man? Am I to say, "Take that sin to Christ and ask him to deliver you?" No, what the apostle Paul tells him is this: "Let him that stole, steal no more." Just that. Stop doing it. And if it is fornication or adultery or lustful thoughts, again: Stop doing it, says Paul. He does not say, "Go and pray to Christ to deliver you." No. You stop doing that, he says, as becomes children of God.
From D. Martyn Lloyd-Jones, Sanctified Through the Truth: The Assurance of Our Salvation (Wheaton: Crossway, 1989), 54.