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CHAP. VII.
II. THE second Use is of Instruction, which may inform us in sundry very necessary truths, and direct us in several duties from the consideration of these Sure Mercies of David, and the aforesaid way of making them Sure.
1. It instructs concerning the great diffe∣rence betwixt the Covenant of Works and the Covenant of Grace. Divines use to give several differences betwixt them. But in∣deed this is the main, that the former was consisting in an inherent righteousness, the other in imputed; in the first man was to perform personal, perfect, and perpetual Righteousness, in this second our surety and great Mediator undertakes it for us, and it is applyed to us by faith, which is now be∣come the Evangelical condition, in the room of that legal condition of compleat obedi∣ence; so that was struck betwixt God and man immediately, this through an inter∣posing Mediator, Gal. 3.19. the former was soon broken, because though man was up∣right, yet he was mutable and that we feel to our cost; but Jesus Christ the great Me∣diator of this new Covenant is the Lord Je∣hovah, the mighty God, the everlasting Father, the Prince of Peace, able to save to the utter∣most; he is God and changeth not, therefore are not we consumed, and therefore are souls saved: