The new birth or regeneration is an inner recreating of fallen human nature by the Holy Spirit. It changes the disposition from lawless, godless self-seeking into one of trust and love, of repentance for past rebelliousness and unbelief, and loving compliance with Gods law henceforth. It enlightens the blinded mind to discern spiritual realities and liberates and energizes the enslaved will for free obedience to God.
The use of the figure of new birth to describe this change emphasizes two facts about it. The first is its decisiveness. The regenerate man has forever ceased to be the man he was; his old life is over and a new life has begun; he is a new creature in Christ, buried with him out of reach of condemnation and raised with him into a new life of righteousness.
The second fact emphasized is that regeneration is due to the free, and to us, mysterious, exercise of divine power. Infants do not induce or cooperate in their own procreation and birth; no more can those who are dead in trespasses and sins prompt the quickening operation of Gods Spirit within them.