Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.
1 Peter 1:23 (KJV)
We are born again through the incorruptible seed of the Word of God. The part of us that is born again is our spirit, and so in our born again spirit we already are of the exact same nature as Jesus who is the Word made flesh. Meditating on the Word, confessing the Word over our lives, and fellowshipping with the Lord in the spirit enables what is already true about us in Christ—in the Word—to be made manifest in the natural.