“It was absolutely necessary also, that our Mediator and Surety should be God as well as man. For as he could neither have obeyed, nor suffered, if he had not possessed a created nature; so, had he been a mere man, however immaculate, he could not have redeemed one soul. Nay, though he had possessed the highest possible created excellencies, they would not have been sufficient; because he would still have been a dependent being. For as it is essential to Deity, to be underived and self-existent; so it is essential to a creature, to be derived and dependent. The loftiest seraph that sings in glory is as really dependent on God, every moment of his existence, as the meanest worm that crawls. In this respect, an angel and an insect are on a level. Every intelligent creature, therefore, whether human or angelic, having received existence from the Almighty, and being continually dependent on him, as the all-producing, all-supporting first cause; must be obliged to perpetual obedience, by virtue of that relation in which he stands to God, as his Maker and Preserver. It is highly absurd to suppose it possible for any creature to supererogate, or to do more in a way of obedience to Him from whom his all was received, than he is under the strongest obligations to perform, in consequence of his absolute and universal dependence. But whatever is previously due from any one, on his own account, cannot be transferred to another, without rendering the first devoid of that obedience which it is absolutely necessary for him to have. Universal obedience, in every possible instance, is so necessary in a rational creature, as such, being dependent on God and created for his glory, that the omission of it, in any degree, would not only be criminal, but expose to everlasting ruin.
The righteousness, therefore, of a mere creature, however highly exalted, could not have been accepted by the Great Supreme, as any compensation for our obedience. Because whoever undertakes to perform a vicarious righteousness, must be one who is not obliged to obedience on his own account. Consequently, our Surety must be a Divine Person; for every mere creature is under indispensable obligations to perfect and perpetual obedience. Now, as our situation required, so the gospel reveals, a Mediator and Substitute thus exalted and glorious. For Jesus is described as a Divine Person, as one who could, without any arrogance, or the least disloyalty, claim independence; and, when thus considered, he appears fit for the task. But of such an One we could have had no idea, without that distinction of Persons in the Godhead which the Scriptures reveal. Agreeably to this distinction, we behold the rights of Deity asserted and vindicated, with infinite majesty and authority, in the person of the Father; while we view every Divine perfection displayed and honoured, in the most illustrious manner, by the amazing condescension of the eternal Son: By the humiliation of Him who, in his lowest state of subjection, could claim an equality with God. Such being the dignity of our wonderful Sponsor, it was by his own voluntary condescension that he became incarnate, and took upon him the form of a servant. By the same free act of his will he was made under the law, to perform that obedience in our stead, to which, as a Divine Person, he was no way obliged.
The necessity there was that our Surety should be a Divine Person, might be further proved, by considering the infinite evil there is in sin. That sin is an infinite evil, appears from hence. Every crime is more or less heinous, in proportion as we are under obligations to the contrary. For the criminality of any disposition, or action, consists in a contrariety to what we ought to possess, or perform. If, therefore, we hate, disobey, or dishonour any person, the sin is always proportional to the obligations we are under to love, to honour, and to obey him. Now the obligations we are under to love, to honour, and to obey any person, are in proportion to his loveliness, his dignity, and his authority. Of this, none can doubt. If then infinite beauty, dignity, and authority belong to the immensely glorious God; we must be under equal obligations to love, to honour, and to obey him; and a contrary conduct must be infinitely criminal. Sin, therefore, is a violation of infinite obligation to duty; consequently an unlimited evil, and deserving of infinite punishment. Such being the nature of our offences, and of the aggravations attending them, we stand in absolute need of a surety, the worth of whose obedience and sufferings should be equal to the unworthiness of our persons, and to the demerit of our disobedience. If to the evil there is in every sin, we take into consideration the vast number of sinners that were to be redeemed; the countless millions of enormous crimes that were to be expiated; and the infinite weight of Divine wrath that was to be sustained; all which were to be completed in a limited and short time, in order to reconcile man to God, and to effect his eternal salvation; we shall have still stronger evidence in proof of the point.
Were a defence of the proper Deity of Christ my intention, the Scriptures would furnish me with ample matter and abundant evidence in favour of the capital truth. For the names that he bears, the perfections ascribed to him, the works he has done, and the honours he has received, loudly proclaim his ETERNAL DIVINITY. But I wave the attempt, and proceed to observe,
That it was necessary our Surety should be God and man, in unity of person. This necessity arises from the nature of his work; which is that of a Mediator between God, the offended Sovereign, and man, the offending subject. If he had not been a partaker of the Divine nature, he could not have been qualified to treat with God; if not of the human, he would not have been fitted to treat with man. Deity alone was too high to treat with man; humanity alone was too low to treat with God. The eternal Son therefore assumed our nature, that he might become a middle person; and so be rendered capable of laying his hands upon both, (Job 9:33) and of bringing them into a state of perfect friendship. He could not have been a mediator, in regard to his office, if he had not been a middle-person, in respect of his natures. Such is the constitution of his wonderful person, and hence he is called IMMANUEL God with us, or in our nature.”