We are convicted by the Holy Spirit before conversion. Many have been under conviction who have resisted the Holy Spirit (Acts 7:51). They have spurned the Spirit of grace to their own just condemnation (Hebrews 10:29). Conviction of sin by the Holy Spirit is grace common to all mankind. Yet, conviction without regeneration brings no conversion.
Those who are under Holy Spirit conviction may come to conversion. There is no conversion without conviction. God's Spirit alone brings conviction to the person who is lost without Christ. When we pray for those who are lost, we should pray that the Holy Spirit will convict them.
The Holy Spirit convicts of the sin known as unbelief. It is the sin that separates us from the grace and love of God in Christ Jesus (John 16:7-11). Only by believing on the Lord Jesus Christ are we saved from condemnation and eternal judgment (John 3:36; Acts 16:30-31).
The Holy Spirit likewise convicts of righteousness (John 16:8). He convinces us of the righteousness of Christ. This is conclusive evidence that our self-righteousness can never save us. Only the righteousness of Christ, accounted to us by faith alone, can please God (Romans 4:5).
The Holy Spirit brings conviction before regeneration and conversion. Conversion to the Lord Jesus Christ gives all the glory to God, knowing that the Spirit of grace brings conviction and regeneration.