Q & A 22 The Incarnation.
Q. 22 How did Christ, being the Son of God, become man?
A. 22 Christ, the Son of God, became man, by taking to Himself a true body, and a reasonable soul, being conceived by the power of the Holy spirit, in the womb of the virgin Mary, and born of her, yet without sin.
As the last answer affirmed, the Son is from everlasting. Therefore, He took on the human nature-body and soul, through the miracle of the virgin birth. Indirectly this answer also affirms a biblical anthropology-humans are body and soul. Soul is more than just life in the body, as some assume. Our souls are reasonable. Jesus said that His soul was “exceedingly sorrowful, even to death” (Mt. 26:38). He, and we, are also not tripartite, for there is no mention of a separate spirit. Another thing we learn is that Jesus was born of the virgin Mary. This was in fulfillment of the prophetic witness (Cf. Is. 6:14; Lk. 1:31-35). However, Jesus still was born of Mary’s flesh (Cf. Gal. 4:4). Therefore, as was seen earlier in regard to the fall and human depravity, this condition did not pass to all humanity through being born flesh and blood, but via our covenantal representation in Adam, for Jesus was without sin (Cf. II Cor. 5:21).