How do we know that true conversion is necessary according to the Bible?

The need for true conversion is emphasized throughout Scripture, particularly in the Apostle Paul's teachings. In Acts 26:18, we learn that genuine conversion opens a person's eyes, turning them from darkness to light and leading them to receive forgiveness of sins. This transformation is not merely intellectual but signifies a complete turning away from sin to serve God. Authentic Christians exhibit a profound change in their lives, affirming their election by God, which is further evidenced by a desire for obedience and the fruits of the Spirit in their lives.