God is not only supremely merciful, but also supremely just. And His justice requires (as He has revealed Himself in His Word) that our sins committed against His infinite majesty should be punished, not only with temporal but with eternal punishments, both in body and soul; which we cannot escape, unless satisfaction be made to the justice of God.
Since, therefore, we are unable to make that satisfaction in our own persons, or to deliver ourselves from the wrath of God, He has been pleased of His infinite mercy to give His only begotten Son for our Surety, who was made sin, and became a curse for us and in our stead, that He might make satisfaction to divine justice on our behalf.
The death of the Son of God is the only and most perfect sacrifice and satisfaction for sin, and is of infinite worth and value, abundantly sufficient to expiate the sins of the whole world.
This death is of such infinite value and dignity because the person who submitted to it was not only really man and perfectly holy, but also the only begotten Son of God, of the same eternal and infinite essence with the Father and the Holy Spirit, which qualifications were necessary to constitute Him a Savior for us; and, moreover, because it was attended with a sense of the wrath and curse of God due to us for sin.
Moreover, the promise of the gospel is that whosoever believes in Christ crucified shall not perish, but have eternal life. This promise, together with the command to repent and believe, ought to be declared and published to all nations, and to all persons promiscuously and without distinction, to whom God out of His good pleasure sends the gospel.
And, whereas many who are called by the gospel do not repent nor believe in Christ, but perish in unbelief, this is not owing to any defect or insufficiency in the sacrifice offered by Christ upon the cross, but is wholly to be imputed to themselves.
But as many as truly believe, and are delivered and saved from sin and destruction through the death of Christ, are indebted for this benefit solely to the grace of God given them in Christ from everlasting, and not to any merit of their own.