Jesus Christ the same yesterday, and to day, and forever. — Hebrews 13:8
As Christ is one of the persons of the Trinity, He is God, and so hath the divine nature, or the Godhead, dwelling in Him, and all the divine attributes belong to Him, of which immutability or unchangeableness is one. Christ in His human nature was not absolutely unchangeable, though His human nature, by reason of its union with the divine, was not liable to those changes to which it was liable as a mere creature; as for instance, it was indestructible and imperishable. Having the divine nature to uphold it, it was not liable to fall and commit sin, as Adam and the fallen angels did; but yet the human nature of Christ, when He was upon earth, was subject to many changes. It had a beginning: it was conceived in the womb of the Virgin; it was in a state of infancy, and afterward changed from that state to a state of manhood. This was attended not only with a change on His body, by His increasing in stature, but also on His mind; for we read that He not only increased in stature but also in wisdom (see Luke 2:52). The human nature of Christ was subject to sorrowful changes, though not to sinful ones. He suffered hunger and thirst and cold; and at last He suffered dreadful changes by having His body tortured and destroyed and His soul poured out unto death; and afterward His body became subject to a glorious change at His resurrection and ascension. And that His human nature was not liable to sinful changes, as Adam’s or the angels’ was not owing to anything in His human nature, but to its relation to the divine nature that upheld it. But the divine nature of Christ is absolutely unchangeable, and not liable to the least alteration or variation in any respect. It is the same now as it was before the world was created.
Editor: Dustin W. Benge, Journey toward Heaven