How do we know if someone is truly born again?

To ascertain if someone is truly born again, one should look for evidence of transformation in their life. According to Jesus, just as the wind cannot be seen but its effects are evident, likewise, the new birth produces visible change in the believer's life. A person who is born of the Spirit will show a deep yearning for the things of God, a departure from a solely fleshly existence, and an increasing desire to share the gospel and worship Him. This change is not merely behavioral; it reflects a heart that has been regenerated by God's power, drawing them toward Christ and His righteousness.