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BOOK III. The Covenant of Grace, its Nature and Benefits. (Book 3)
CHAP. I. Gods part of the Covenant doth consist in Promises.
SECT. I. What Promises are: why and how the Covenant of Grace doth consist of Promises, and of what.
HAving spoken thus far of two general heads, (1) the Person that made the Co∣venant, and had the first great hand in it, and that was God, and therefore it's called Gods Covenant, and not mans, I will establish my Covenant between me and thee, (2) the persons with whom this Covenant is made, and that in a threefold subordination; [1] with Christ as Mediator, as a publick person, as the second Adam, [2] with Believers in him, [3] in them with all their seed: Let us now come to look into the nature of this Covenant more particularly, and examine the essentials thereof. There are three things that are ordinarily distinguished by Divines, a Law, a Testament, and a Covenant; A Law depends upon the absolute Soveraignty of the Law-giver, and requires subjection, whether the persons commanded consent to it or no; and so all the Laws of God do depend upon the absolute Soveraignty of God, as he is a Law-giver, able to save and to destroy: A Testament is grounded only upon the Will of the Testator, bequeathing of such Legacies freely without requiring the consent of the party to whom they are be∣queathed; but a Covenant differs from them both, in this, that it requires the consent and agreement of both parties, and therein each party binds himself freely to the performance of several conditions each to other. Cocceius doth ground it upon that place Heb. 8.6. A Covenant established upon better promises, and he defines it thus;* 1.1 It is a Law that God esta∣blishes upon Promises: and therefore implies two things, something on Gods part, which is the promise, and something on mans part, which is the duty, and unto both these consent of parties is required; Gods consent unto the promise, and mans consent unto the ser∣vice; and therefore by a Synecdoche the name Covenant is applied unto both parts of these, and both of them are called the Covenant. (1) The Covenant is sometimes put for the Promise of God, which is the Covenant on Gods part:* 1.2 Behold I will make a Covenant be∣fore all thy people, I will do marvels: the meaning is no more but voluntaria promissione me obstringo, &c. I bind my self by a voluntary promise. This is my covenant with thee,* 1.3 says the Lord, My Spirit that is put upon thee, and my words which I have put in thy mouth, &c. Numb. 18.19. All the heave-offering of the holy things, which the children of Israel offer unto the Lord, have I given thee and thy sons by a statute for ever, it it a covenant of salt for ever, before the Lord. It is spoken only of the free promise of God made unto Aaron and his sons in refe∣rence unto the Prieshood. (2) The Covenant is sometimes put for the command of God, in which he doth require a duty from man. Moses was with the Lord in the Mount forty days and nights, and he writ upon the Tables the words of the Covenant,* 1.4 the ten Command∣ments; and it's common in Scripture-acceptation, to put the command of God and the duty of man under the name of the Covenant of God. So that there are in the essentials of the Covenant two things, (1) there is the promise on Gods part, which is Gods part of the Covenant, (2) there is the duty on man's part in reference unto the command of God, there is mercy and duty, and mutual consent of both.