Son of Man and Son of God

Who is this One whose birth we celebrate at Christmas? Why does He bear the titles “Son of Man” and “Son of God”?
John opened his gospel with a description of Jesus: “In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God” (John 1:1-2). Do you see the truth revealed here? John tells us that the Word – Jesus – was with God and the Word was God. Jesus is a member of the triune Godhead!
But John has more to tell us about the Word: “And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth” (1:14). The Word begotten – born of God – became the Son of Man. Because you and I are flesh and blod, Jesus became the same: a human being. Yet He remained God. It’s the mystery of the incarnation. The Christ of Christmas was – is – God in the flesh. Every bit God and every bit man.
And what was the purpose of His becoming flesh? Hebrews 2:17 tells us that “He had to be made like His brethren in all things, so that He might… make propitiation for the sins of the people.” The Word became flesh to die in your place, because even when you were yet a sinner, you were beloved of God!
(Kay Arthur)