5. Our Lord Jesus Christ is called the Son of God, in a sense not applicable to any other; as his Sonship includes in it his deity, and his having, in his human nature, received a commission from the Father, to engage in the great work of our redemption, as becoming surety for us; which is the foundation of all those saving blessings which we enjoy or hope for.
6. Believers are called the sons of God, by a special adoption; which is farther to be considered, as being the subject-matter of this answer. Adoption is a word taken from the civil law; and it was much in use among the Romans, in the apostles time, in which it was a custom for persons, who had no children of their own, and were possessed of an estate, to prevent its being divided or descending to strangers, to make choice of such who were agreeable to them, and beloved by them, whom they took into this political relation of children; obliging them to take their name upon them, and to pay respect to them, as though they were their natural parents; and engaging to deal with them as though they had been so; and accordingly to give them a right to their estates, as an inheritance. This new relation, founded in a mutual consent, is a bond of affection; and the privilege arising from thence is, that he who is, in this sense, a father, takes care of, and provides for the person whom he adopts, as though he were his son by nature; and therefore Civilians calls it an act of legitimation, imitating nature, or supplying the place of it: and this leads us to consider,
II. The difference between adoption, as used by men, and as it is applied in this answer, to God’s taking persons into this relation, as his children.
1. When men adopt, or take persons into the relation of children, they do it because they are destitute of children of their own to possess their estates; and therefore they fix their love on strangers: but God was under no obligation to do this: for if he designed to manifest his glory to any creatures, the holy angels were subjects capable of receiving the displays thereof; and his own Son, who had all the perfections of the divine nature, was infinitely the object of his delight, and, in all respects, fitted to be as he is styled, Heir of all things, Heb. i. 2.
2. When men adopt, they are generally inclined to do it by seeing some excellency or amiableness in the persons whom they fix their love upon. Thus Pharaoh’s daughter took up Moses, and nourished him for her own son, because he was exceeding fair, Acts vii. 20, 21. or, it may be, she was moved hereunto, by a natural compassion she had for him, besides the motive of his beauty; as it is said, The babe wept, and she had compassion on him, Exod. ii. 6. And Mordecai adopted Esther, or took her for his own daughter; for she was his uncle’s daughter, and was fair and beautiful, and an orphan, having neither father nor mother, Esther ii. 7. But when God takes any into this relation of children, they have no beauty or comeliness, and might justly have been for ever the objects of his abhorrance. Thus he says concerning the church of Israel, when he first took them into this relation to him, None eye pitied thee, but thou wast cast out in the open field, to the loathing of thy person: and when I passed by thee and saw thee polluted in thine own blood, I said unto thee when thou wast in thy blood, Live, &c. Ezek. xvi. 5. It might indeed be said concerning man, when admitted to this favour and privilege, that he was miserable; but misery, how much soever it may render the soul an object of pity, it could not, properly speaking, be said to be a motive or inducement from whence the divine compassion took its first rise, as appears from the account we have of the mercy of God, as founded only on his sovereign will or pleasure; as he says, I will have mercy on whom I will have mercy; and I will have compassion on whom I will have compassion, Rom. ix. 15. and also, from the consideration of man’s being exposed to misery by sin, which rendered him rather an object of vindictive justice than mercy. This therefore cannot be the ground of God’s giving him a right to an inheritance; and consequently adoption is truly said, in this answer, to be an act of the free grace of God.
3. When men adopt, their taking persons into the relation of children, is not necessarily attended with any change of disposition or temper in the persons adopted. A person may be admitted to this privilege, and yet remain the same, in that respect, as he was before: but when God takes his people into the relation of children, he gives them, not only those other privileges which arise from thence, but also that temper and disposition that becomes those who are thus related to him. This leads us to consider,
III. The reference which the sonship of believers has to the superior and more glorious Sonship of Jesus Christ; and how it is said to be for his sake. Here we must suppose that there is a sense in which Christ is said to be the Son of God, as the result of the divine decree, which contains in it an idea very distinct from his being a divine person; for that was not the result of the will of the Father; whereas it is said concerning him, I will declare the decree; the Lord hath said unto me, Thou art my Son, this day have I begotten thee, Psal. ii. 7. And elsewhere, he hath, by inheritance, obtained a more excellent name than the angels; and this is the consequence of God’s saying to him, thou art my Son, this day have I begotten thee: and, I will be to him a Father, and he shall be to me a Son, Heb. i. 4, 5. which plainly refers to Christ as Mediator. Now when we consider this mediatorial Sonship of Christ, if I may so express it, we are far from asserting, that Christ’s Sonship, and that of believers, is of the same kind; for, as much as he exceeds them as Mediator, as to the glory of his person and office, so much is his Sonship superior to theirs. This being premised, we may better understand the reference which the sonship of believers has to Christ’s being the Son of God as Mediator; and therefore let it be farther considered,[[67]]
1. That it is a prerogative and glory of Christ, as the Son of God, that he has all things which relate to the salvation of his elect, put into his hand; and therefore, whatever the saints enjoy or hope for, which is sometimes called in scripture their inheritance, agreeably to their character, as the children of God by adoption; this is considered as first purchased by Christ, and then put into his hand; in which respect it is styled his inheritance, he being constituted, pursuant to his having accomplished the work of redemption, heir of all things; and as such, has not only a right to his people, but is put in possession of all those spiritual blessings in heavenly places, wherewith they are blessed in him, Eph. i. 3.
2. From hence it follows, that the sonship of believers, and their right to that inheritance, which God has reserved for them, depends upon the sonship of Christ, which is infinitely more glorious and excellent. As God’s adopted sons, they have the honour conferred upon them, of being made kings and priests to him, Rev. i. 6. These honours are conferred by Christ; and, in order thereunto, they are first given to him to bestow upon them: thus he says, I appoint unto you a kingdom, as my Father hath appointed unto me, Luke xxii. 29. Christ is first appointed heir of all things, as Mediator; and then his people, or his children, are considered as heirs of God, as the apostle expresses it; and joint heirs with Christ, Rom. viii. 17. Not that they have any share in his personal or mediatorial glory; but when they are styled joint-heirs with him, we must consider them as having a right to that inheritance, which he is possessed of in their name as Mediator: and in this sense we are to understand those scriptures that speak of God’s being first the Father of our Lord Jesus Christ; and then, to wit, in him our Father; accordingly he says, I ascend unto my Father, and your Father, and to my God, and your God, John xx. 17. And elsewhere, God is styled the Father of our Lord Jesus Christ, and then the Father of mercies, or, our merciful Father, 2 Cor. i. 3. And elsewhere the apostle says, Blessed be the God and Father of our Lord Jesus Christ; who hath blessed us with all spiritual blessings, in heavenly places, in Christ; having predestinated us unto the adoption of children, by Jesus Christ, to himself, Eph. i. 3. compared with 5. and inasmuch as he designed to bring many sons to glory, as being made meet to be partakers of the inheritance of the saints in light; he first made the captain of their salvation perfect through sufferings, Heb. ii. 10. compared with Col. i. 12. In this respect our right to the inheritance of children, is founded in the eternal purpose of God, relating hereunto, and the purchase of Christ, as having obtained this inheritance for us.
IV. We are now to consider the privileges conferred on, or reserved for them who are the sons of God by adoption. These are summed up in a very comprehensive expression, which contains an amazing display of divine grace; as it is said, He that overcometh, shall inherit all things; and I will be his God, and he shall be my son, Rev. xxi. 7. It is a very large grant that God is pleased to make to them; they shall inherit all things. God is not ashamed to be called their God; and in having him, they are said to possess all things, which are eminently and transcendently in him; they have a right to all the blessings which he had designed for, and which have a tendency to make them completely happy: in this sense we are to understand our Saviour’s words in the parable; Son, thou art ever with me, and all that I have is thine, Luke xv. 31. Nothing greater than this can be desired or enjoyed by creatures, whom the Lord delights to honour. But, that we may be a little more particular in considering the privileges which God confers on, or has reserved for his children, it may be farther observed,