And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth. John bore witness of Him and cried out, saying, “This was He of whom I said, ‘He who comes after me is preferred before me, for He was before me.’” (John 1: 14-15)
The Son of God who was from eternity became human, with limitations in time and space (Phil. 2:5–8). This is the doctrine of the incarnation: God became human. Nothing of the essential nature of deity was lost in this event; we might rephrase became as “took to Himself.” John uses the word flesh to refer to the physical nature of humans, not to our sinful disposition (Rom. 8:1–11).