There was no more thinking going on in the infant human mind of Jesus, than in the case of any other infant. The baby lay in the manger unconscious and inactive. Yet the eternal Logos was personally united with this infant. There was a God-man in the manger as truly as there was upon the cross.
While growing up from being Mary and Josephs Baby to a young Man Jesus began learning about His Fathers business, being a Carpenter’s Son. Until a few years later learning to build and repair Cabinets, Dressers, and Tables. A few years later Jesus Christ began Preaching in the Temple.
Though beginning in time, the theanthropic personality of the Redeemer continues forever. This is taught in Rom. 9:5, “Of whom as concerning the flesh years later Jesus Christ came, who is over all God blessed forever:” in Col. 2:9, “In him dwelleth [now and forever] all the fulness of the Godhead, bodily;” in Heb. 13:8, “Jesus Christ, the same yesterday, to-day and forever:” in Eph. 2:6, “Believers sit together in heavenly places in Christ Jesus:” in Heb. 4:14, 15, “We have a great high priest who hath passed into the heavens.”
The incarnation makes no change in the constitution of the Trinity. It leaves in the Godhead, as it finds in it, only three persons. For the addition of a human nature to the person of the Logos, is not the addition of another person to him. The second trinitarian person, though so much modified by the incarnation as to become a God-man, is not so much modified as to lose his proper trinitarian personality, because incarnation is not the juxtaposition of a human person with a divine person, but the assumption of a human nature to a divine person.
He thinks like God, and he thinks like a man. He has the eternal, all-comprehending, and successions consciousness of God; and he has the imperfect, gradual, and sequacious consciousness of man. In this way, the trinitarian relations of the second person remain unchanged by his incarnation. The divine nature, though it condescends to exist and act in and through a human soul and body, and to be trammelled by it, at the same time is existing and acting in an untrammeled manner throughout the universe of finite being, and in the immensity of the Godhead.