How do we know we need to be born again?

Jesus explicitly taught the necessity of being born again in John 3:3 when He told Nicodemus that one must be born again to enter the Kingdom of God. This new birth, or regeneration, is essential because all human beings are born into a state of spiritual death due to Adam's sin. Without this divine intervention, we would remain unable to perceive spiritual truths and would continue to trust in false ways of salvation. Only through God's grace are we made alive, as illustrated in Ephesians 2:5, where it says, 'even when we were dead in sins, hath quickened us together with Christ.' Thus, to recognize our need for a new birth is to acknowledge our disconnection from God and our reliance on His grace for salvation.