What is the effect of the Holy Spirit in a believer's life?

The Holy Spirit plays a crucial role in the life of every believer by effectually calling them to faith in Christ. This calling enables believers to live according to God's will and not under the law (Galatians 5:18). The Spirit also produces spiritual fruit within believers, as described in Galatians 5:22-23, showing that a life transformed by grace will naturally express love, joy, peace, and other virtues. The Holy Spirit serves to reassure believers of their standing before God, demonstrating that they are indeed children of God, leading them to walk in righteousness, which is the evidence of their faith.