FIRST, And first, I shall lay down this for a truth; That it is not any Spirit only by, and of itself, without it do take the nature of man, that can be a Saviour of man from eternal vengeance.
Or thus: That that [which] will be a Saviour of man, must in the nature of man satisfy and appease the justice and wrath of God. And the arguments that I do bring to prove it by, are these.
First, Because it was man that had offended; and justice required that man must give the satisfaction: And therefore, when he that should be the Saviour, was come, he 'took upon him the form of a servant, and was made in the likeness of men' (Phil 2:7; Heb 2:14). Because 'the children are partakers of flesh and blood; he also himself likewise took part of the same'; To what end? 'that through death he might destroy him that had the power of death, that is, the devil.' And is that all? No; but also that he might 'deliver them who through fear of death, were all their lifetime subject to bondage' (v 15).
Second, The second argument is this; because, if a spirit only could have made satisfaction for the sin of mankind, and have subdued Satan for man, without the nature of man, either there had been weakness in Body when he made that promise to fallen Adam, That the seed of the woman should break the serpent's head; (for there hath been no need of and so no room for that promise) or else God having made it, would have appeared unfaithful, in not fulfilling his promise, by redeeming the world without it.
Third, If a spirit only could have made satisfaction, and so have saved man; then Christ needed not to have come into the world, and to have been born of a woman (Gal 4:4). But in that he must come into the world, and must be born of a woman, it is clear, that without this, he could not have been a Saviour: For he was made of a woman, made under the law, to this end, that he might redeem them that were under the law; implying, No subjection to this, (viz. the taking of the nature of man) no redemption from the curse of the law. But Christ hath delivered from the curse of the law (all that believe in his name) being in their nature made a curse for them.
And this is the reason, why the fallen angels are not recovered from their damnable estate, because, he did not take hold of their nature, 'For verily he took not on him the nature of angels; but he took on him the seed of Abraham' (Heb 2:16).
SECOND, Now then, seeing this is the very truth of God, I shall next prove, that Jesus that was born of the virgin, to be the Saviour. And,
First, I shall prove it by comparing some places of the Old and New testament together, and by some arguments drawn from the scriptures.
1. And first, see Genesis 3:15, where he is called the seed of the woman, saying, 'I will put enmity between thee and the woman, and between thy seed and her seed'; and so was Jesus (Gal 4:4) where it is said, 'God sent forth his Son, made of a woman,' or born of a woman.
2. This woman must be a virgin (Isa 7:14) where it is said, 'A virgin shall conceive, and bear a son, and shall call his name Imanuel.' And Jesus is he that was the fulfilling of this scripture (Matt 1:22,23), 'Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying, Behold, a virgin shall be with child, and shall bring forth a Son, and they shall call his name Imanuel.'