"A preacher may induce a man to believe what Scripture says about his lost condition, persuade him to bow to the divine verdict, and then accept Christ as his personal Saviour. No man wants to go to Hell, and if he is assured intellectually that Christ stands ready as a fire escape, on the sole condition that he jump into His arms (“rest on His finished work”), thousands will do so.
But a hundred preachers are unable to make an unregenerate person realize the dreadful nature of sin, or show him that he has been a lifelong rebel against God, or change his heart so that he now hates himself and longs to please God and serve Christ. Only the Spirit can bring man to the place where he is willing to forsake every idol, cut off a hindering right hand, or pluck out an offending right eye (see Matthew 5:27-30)." ~A. W. Pink