What is the Gospel of Christ?
It is the good tidings that God has revealed concerning Christ…. All mankind was lost in Adam and became the children of wrath, and was put under the sentence of death. God, though He left His fallen angels and has reserved them in the chains of eternal darkness, has…provided a way of atonement to reconcile them to Himself again.
Namely, the Second Person in the Trinity takes man’s nature upon Him and becomes the Head of a second covenant, standing charged with man’s sin, and answering for it by suffering what the Law and Divine Justice required. He made satisfaction and kept the Law perfectly, which satisfaction and righteousness He offered up unto the Father as a sweet savor of rest for the souls of those that are given to Him.
And now this mediation of Christ is, by the appointment of the Father, preached to the children of men, of whatever nation or rank, freely offering this unto sinners for atonement for them, requiring them to believe in Him and, upon believing, promising not only a discharge of all their former sins, but that they shall not enter into condemnation, that none of their sins or unworthiness shall ever hinder the peace of God with them, but that they shall, through Him, be received into the number of sons.
They shall have the image of God renewed again in them, and they shall be kept by the power of God through faith unto salvation. These souls and bodies shall be raised to the height of glory that such creatures are capable of. They shall live forever, enjoying the presence of God and Christ in the fullness of all good. This is the gospel of Christ.
Jeremiah Burroughs [1599–1645], Gospel Conversation (SDG, 1995), pgs 4–5. [Sourced from Phillip L. Simpson, A Life of Gospel Peace: A Biography of Jeremiah Burroughs, (RHB, 2013), pgs 151–152], paragraphing added.