How do we know the Holy Spirit is active in the lives of Christians?

The activity of the Holy Spirit in a believer’s life is evidenced through the gifts He provides, such as faith, understanding, and the ability to love and serve others as described in Galatians 5:22-23. Additionally, the fruit of the Spirit is produced in the heart of the believer, leading them to love, joy, peace, and other characteristics that reflect Christ. This transformation is not through human effort but is a result of the Holy Spirit's work. When believers recognize these changes and the desire to live for Christ, they can be assured of the Spirit's presence and influence in their lives.