8 And when He has come, He will convict the world of sin, and of righteousness, and of judgment: 9 of sin, because they do not believe in Me; 10 of righteousness, because I go to My Father and you see Me no more; 11 of judgment, because the ruler of this world is judged (John 16:8–11, NKJV).
Jesus promised to send the Holy Spirit to His apostles (which He did, Acts 1:3-4, 8; 2:1-4). The Spirit would (1) Teach them and give them a remembrance of all the things Jesus said (John 14:25-26), (2) Testify of Jesus through the apostles (John 15:26), and (3) Guide the apostles into all truth (John 16:13). The Holy Spirit revealed the gospel to the apostles, inspired their proclamation of it, and confirmed its divine source by accompanying signs and miracles (Mark 16:15-20; Acts 1:4-5, 8; 1 Cor. 2:5, 10-13; 14:37; Heb. 2:3-4). The Holy Spirit continues to work today, convincing the world “of sin, and of righteousness, and of judgment” by the New Testament of Christ, the powerful word of God He revealed, inspired, and confirmed. Using the word of truth, the Holy Spirit convicts the world (1) Of sin, providing the remedy in Christ (Acts 2:36-41; Titus 2:11-13). (2) Of righteousness because Jesus is reigning in righteousness at God’s right hand (Rom. 1:16-17; Acts 2:33-36; Heb. 1:8-9), and (3) Of judgment because Jesus has overcome the evil one (John 12:31). Let the Holy Spirit work in your life by receiving and obeying the word of truth He gave the world through the apostles of Christ.