Culverwell:
For the better understanding and practice of this duty, of particular application of God’s promises to our several necessities, that so we may thereby live by Faith, (which is the chief thing by me intended in this Treatise) we are advisedly to consider the nature and kinds of these promises (which be the foundation of our Faith), that so we may more soundly apply them to our several occasions and uses.
By God’s promises, I understand generally all those declarations of God’s will, wherein he offers us to his Word any good thing to enjoy: as on the other side, by threats are meant those declarations of his Will, wherein he denounces any evil against us for sin. Both which he plentifully sets down in the Holy Scriptures to these ends, that by his promises he might allure and draw us to believe and obey his will; and by his threatenings he might scare us from sin: In all which God does declare his will after a double manner, either absolutely, or conditionally. Absolutely, what he will most certainly do, any thing to the contrary notwithstanding. As for example, “That there shall be no more waters of a flood to destroy all flesh.” And, “in this same time I will come, and Sarah shall have a son,” which the Apostle says, is a word of promise: of this sort be all of God’s promises concerning salvation made unto the Elect, which cannot be made void by any means whatsoever.
The other manner whereby God does reveal his will, is not absolute, but (as it is commonly said to be) conditional, which is, when God declares his will, what he will do if we do our part, else not: this conditional promise well understood, may be born; otherwise misunderstood, it destroys the nature of the free and gracious promise of the Gospel, and in this respect confounds the Law and the Gospel, taking away a chief difference between the Covenant of Works (wherein God promised life upon the condition of doing all that was written in the Law, without which condition performed on our parts, God did not covenant to give life): and the Covenant of Grace, wherein God freely promised, not only life, as Jer. 31, from vers. 31. to 35. read the place. The like Ezek. 36.24. &c. “A new heart also I will give you), &c. In which, and the like many, is no condition expressed on our parts, but God himself makes capable of this grace whom he pleases. How these are by us to be applied, afterwards I will show. But now seeing very many, yea the most of the free gracious promises of the Gospel, be propounded with some condition, either expressed or necessarily understood, we are wise to consider them; As first in this, and the like many, the condition, or duty required, is expressed, Joh. 3:15, “Whosoever believes in Christ, shall not perish but have everlasting life.”