How do we know the doctrine of being born again is true?

The necessity of being born again is a central teaching in the Christian faith, supported by Jesus' dialogue with Nicodemus in John 3:3. He emphasizes that spiritual rebirth is essential for seeing the kingdom of God, signifying that mere religious activity or attendance does not equate to true spiritual life. This new birth is a work of the Holy Spirit, as outlined in Ephesians 2:5, where Paul proclaims that God has made us alive with Christ even when we were dead in transgressions. The reality of regeneration confirms that believers are transformed and empowered to live in accordance with God's will, which is corroborated by their fruits of the Spirit as evidence of true faith.