How do we know the Holy Spirit's role is significant?

The significance of the Holy Spirit's role is highlighted in John 16:7, where Jesus states that it is expedient for Him to go away so that the Comforter, the Holy Spirit, can come. This indicates the Holy Spirit's unique capacity to act in the lives of believers and the world. The Spirit is not just a passive presence but actively works to empower the church in ministry, as seen in Acts 2 during Pentecost where the apostles were filled with the Holy Spirit and began to preach the gospel boldly. Furthermore, He reproves the world of sin, righteousness, and judgment (John 16:8), showing His essential role in the conviction of sin and the proclamation of God's grace. This underscores the historic Reformed view that to be effective witnesses, Christians must rely on the Holy Spirit's guiding and empowering presence.