5. There must be some knowledge of the nature of the gospel covenant, and of the way which now God hath chosen whereby to glorify his grace in the salvation of poor sinners. That God, Father, Son, and Holy Ghost thought good, for the glory of free grace and wisdom, in a way of justice and mercy, to send Jesus Christ to assume man's nature, and so become God and man in two distinct natures, and one person, for ever; and to become under the law, to undergo the curse thereof, and to die the cursed death of the cross, to satisfy justice, and pay the ransom for the redemption of the elect. In which undertaking our Lord was a servant, Isa. xlii. 1, and xlix. 6, and lii. 13, and liii. 11. Zech. iii. 8. Matt. xii. 18; and had furniture from God for all his undertaking, Isa. xlii. 1, and lxi. 1, 2. Matt. xii. 18; and had a promise of seeing his seed, and of prolonging his days, &c. Isa. xliii. 10, 11. Thus there was a covenant of redemption betwixt God and the Mediator; and the Mediator undertaking, was obliged to perform all that he undertook, and accordingly did so. For, as the Lord laid on him, or caused to meet together on him, "the iniquity of us all," Isa. liii. 6, so in due time "he bare our griefs, and carried our sorrows. He was wounded for our transgressions, and bruised for our iniquities, the chastisement of our peace was upon him. He was cut off out of the land of the living, and stricken for the transgression of his people; he made his soul an offering for sin, and bare the iniquities of his people. Pouring out his soul unto death he bare the sin of many, and made intercession for the transgressors," Isa. liii. 4, 5, 10, 11, 12. So "that what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, for sin (or by a sacrifice for sin) condemned sin in the flesh," Rom. viii. 3, "that the righteousness of the law might be fulfilled in us," verse 4. Thus "he made him sin (or a sacrifice for sin) that we might become righteous," 2 Cor. v. 20; and "he was once offered to bear the sins of many," Heb. ix. 28; and "he, through the eternal Spirit, offered himself without spot to God," verse 14, and "his own self bare our sins in his own body on the tree," 1 Pet. ii. 24. There must, I say, be some knowledge of, and acquaintance with this great mystery of the gospel, wherein is declared "the manifold wisdom of God," Eph. iii. 10, and with the noble design of God, in sending his Son, after this manner, to die the death, that condemned sinners might live, and return to the bosom of God; as redeemed "not with gold or silver, or corruptible things but with the precious blood of Christ, as of a lamb without blemish and without spot," 1 Pet. i. 18. And being "so redeemed by blood, to become kings and priests unto God," 1 Pet. ii. 2. Rev. v. 9, 10. The man must not be ignorant of this, else all will be in vain. I do not determine