When God's preachers go forth with the Word of truth they go with great confidence that the Holy Spirit will bless and honor the gospel of Jesus Christ to the conversion and comfort of the elect (Isa. 55:11). Here are several things taught in the word about the Holy Spirit's ministry.
There is no way the preacher can convict the sinner. While he may be able to expose the truth to your head, he is unable to reach your heart. The Holy Spirit through the Word not only spells out our problem (sin), but also reveals and proves it to our heart and causes us to humbly own it before the Holy God. The fact of sin (Rom. 3:23), the filth of sin (Isa. 64:6), the fountain of sin (Matt. 5:19), the fruit of sin (Rom. 6:23). Then He centers in on the target of the problem "unbelief;" this is the great reigning and ruining sin that will condemn our soul (John 3:36). If God has taught and convinced you of what you are; rejoice, only sinners will come before God as mercy beggers (Luke 18:13-14).
The Holy Spirit will also reveal unto the sinner thee absolute righteousness and purity of Jesus Christ. He truly is "Jesus Christ the Righteous." Our Lord had no sin, did no sin and knew no sin (Heb. 7:26). Then He also reveals and teaches us our need of righteousness and shows us that this is freely imputed and fully provided in Jesus Christ. "Blessed is the man to whom God imputeth righteousness without works" (Rom. 4:5). He is the Lord our Righteousness Who ever lives to intercede for us!
The Holy Spirit will reveal unto the sinner what happened at Calvary. The prince of the world (Satan), all principalities and powers have been judged, spoiled, conquered and disarmed by Jesus Christ crucified (Col. 2:15). Christ Jesus also by His glorious sacrifice made an end of our sin. In Christ there is no condemnation to those that are in Him. Because our sins have been eternally judged in our Substitute (2 Cor. 5:21), the believer has been fully acquitted and made righteous before God (Rom.8:1).