having been begotten again, not of corruptible seed, but of incorruptible, through the word of God, which liveth and abideth.

Because you have had a new birth, not from the seed of man, but from eternal seed, through the word of a living and unchanging God.

επειδη ανεγεννηθητε ουχι εκ φθαρτου σπερματος, αλλα αφθαρτου, δια του λογου του Θεου του ζωντος και μενοντος εις τον αιωνα.

Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.