The covenant of works being broken by sin, and made unprofitable unto life, God was pleased to give forth the promise of Christ, the seed of the woman, as the means of calling the elect, and begetting in them faith and repentance;¹ in this promise the gospel, as to the substance of it, was revealed, and [is] therein effectual for the conversion and salvation of sinners.²

¹ Gen. 3:15
² Rev. 13:8

This promise of Christ, and salvation by him, is revealed only by the Word of God;³ neither do the works of creation or providence, with the light of nature, make discovery of Christ, or of grace by him, so much as in a general or obscure way;⁴ much less that men destitute of the revelation of Him by the promise or gospel, should be enabled thereby to attain saving faith or repentance.⁵

³ Rom. 1;17
⁴ Rom. 10:14–15,17
⁵ Prov. 29:18; Isa. 25:7; 60:2–3