How can one be sure they have been born again?

Assurance of being born again is founded on scriptural evidence. 1 John 3:14 says that those who love their brothers have passed from death to life, indicating a change of heart that comes with the new birth. Additionally, believers will exhibit the fruit of the Spirit—such as love, joy, and peace—as evidence of transformation (Galatians 5:22-23). Lastly, a true believer will have authentic faith in the testimony of God concerning His Son (1 John 5:10). These evidences may vary in degree but are essential indicators of genuine spiritual life.