I know of at least one case in which a former prostitute's testimony (I personally knew her and the street preacher who spoke to her) indicates that the ardent intentions of previous preachers to "convict her of her sin" actually had reverse unintended consequences.
I've related her testimony on these forums before. Previous street preachers had condemned her, "You're dead in your sins!" with such vigor that whatever they may (or may not) have said about forgiveness was buried under the condemnation. So she had concluded, "My sins are too great. Okay, I'm just going to hell," and had stopped listening to them.
But in fact, the Holy Spirit was working on her. It was just that nobody had actually preached the gospel.
So when a street preacher finally led his sermon with: Therefore, if anyone is in Christ, the new creation has come: The old has gone, the new is here! It snagged her! This wasn't just being "forgiven" and still dragging the weight of all her past sins around (which is how humans "forgive"--that is, even we Christians say, "I'll forgive but I won't forget"). This was the first preacher she'd heard talking about "blank slate," "redo," "start afresh."
She had actually walked up to him and demanded, 'Is that true?" She hadn't heard that before.
This is the thing:
For God did not send his Son into the world to condemn the world, but to save the world through him. -- John 3:17
For I did not come to judge the world, but to save the world. -- John 12:47
For the accuser of our brothers and sisters, who accuses them before our God day and night, has been hurled down. -- Revelation 12.
Words of condemnation are not the voice of Jesus, but the voice of Satan.