Salvation is already accomplished through the life and death of Jesus Christ, but the saving work of God is not yet complete.
Salvation is not yet at its final fulfillment. The Father and the Son sent the Spirit to fill the world and invite all people to the waters of Salvation and the Kingdom of God.
The mission of the Holy Spirit is inseparable from the mission of Jesus Christ.
"See, how they love one another."
This quote is from Tertullian, who lived at a time when many Christians were willing to die on behalf of their faith. Tertullian identified this self-sacrificing love as the reason for the growth of the church.
Sadly but truthfully, situations like this still exist in many parts of the world. I think the Holy Spirit is ever present in those individuals who stand up for their faith even under threat of immediate harm.