What does the Bible say about sanctification by faith?

In Acts 26:18, Paul articulates that God calls people to turn from darkness to light and from the power of Satan to God, emphasizing that forgiveness of sins and sanctification comes through faith in Christ. This teaching contrasts with the belief held by many Jews at the time, who thought that righteousness could be achieved through obedience to the law. The Apostle Paul, however, asserts that sanctification and justification are accomplished through faith, which is a gift of God's grace, not through human effort or merit. This principle is fundamental in understanding the means by which believers are made holy, which is central to the message of the Gospel.