How do we know that the Holy Spirit empowers Christians?

The evidence of the Holy Spirit's empowerment is seen in the lives of early Christians, notably the apostles on the day of Pentecost. After being filled with the Holy Spirit, they exhibited remarkable boldness and clarity in preaching to thousands, which led many to faith. This contrasts sharply with their previous timid demeanor, demonstrating that the Holy Spirit transforms individuals, equipping them for service and holy living. As believers are filled with the Spirit, they see increased faith, hope, and love, which are fruits of the Spirit's work.