God has made provision for us to be born again, and regenerated through the new birth - in order to give us His life living within. But why would we - the greatest and highest and most wonderful of all earth's creatures - why would we need regeneration? Because a disaster that has stricken each of us, has rendered us uninhabitable by God.
You and I are by nature from birth uninhabitable to God. We were born with a heart that was emitting a deadly radiant far worse than the gamma rays of that exploded reactor; we were producers of the element most hated by God in the Universe, which is called sin.
The presence of sin within each of us made us completely uninhabitable to God. He could never live within us because He is holy, and we are sinful.
Regeneration is when God comes down to the site of the worst disaster in the universe - us sinners - and completely removes the deadly, toxic elements at the core of our being.
Regeneration is a "supernatural work of the Holy Spirit" by which the divine nature and divine life are given (John 3:3-8; Titus 3:5). Regeneration occurs when God sovereignly acknowledges a person's belief of the gospel. Regeneration is the most dramatic change in a new believer; when we are "born again" we enter the family of God.
The gift of salvation is about Jesus who died to take us who are dead in our sins, bring us to life; and welcome us as family members, full of endless life and brand new - that's regeneration!
Taken from "The Miracle of Salvation: Uninhabitable to Inhabited by God" by Discover the Book Ministries (used by permission).