What "born again" means is literally to begin all over again, to be given a second birth, a second chance. The one who is born again doesn't all of a sudden get turned into a super-Christian. To be born again is to enter afresh into the process of spiritual growth. It is to wipe the slate clean. It is to cancel your old mortgage and start again. In other words, you don't have to be always what you have now become. Such an offer is too good to be true for many, confusing for most, but for those who seek to be other than what they are now, who want to be more than the mere accumulation and sum total of their experiences, the invitation, "You must be born again," is an offer you cannot afford to refuse.
The Good Book: Reading the Bible With Mind and Heart, by Peter J. Gomes