“…one must distinguish between, on the one hand, the gospel as what God has done and what is the message to be announced and, on the other, what is demanded by God or effected by the gospel in assorted human responses. If the gospel is the (good) news about what God has done in Christ Jesus, there is ample place for including under “the gospel” the ways in which the kingdom has dawned and is coming, for tying this kingdom to Jesus’ death and resurrection, for demonstrating that the purpose of what God has done is to reconcile sinners to himself and finally to bring under one head a renovated and transformed new heaven and new earth, for talking about God’s gift of the Holy Spirit, consequent upon Christ’s resurrection and ascension to the right hand of the Majesty on high, and above all for focusing attention on what Paul (and others—though the language I’m using here reflects Paul) sees as the matter “of first importance”: Christ crucified. All of this is what God has done; it is what we proclaim; it is the news, the great news, the good news.
By contrast, the first two greatest commands—to love God with heart and soul and mind and strength, and our neighbor as ourselves—do not constitute the gospel, or any part of it. We may well argue that when the gospel is faithfully declared and rightly received, it will result in human beings more closely aligned to these two commands. But they are not the gospel. Similarly, the gospel is not receiving Christ or believing in him, or being converted, or joining a church; it is not the practice of discipleship. Once again, the gospel faithfully declared and rightly received will result in people receiving Christ, believing in Christ, being converted, and joining a local church; but such steps are not the gospel. The Bible can exhort those who trust the living God to be concerned with issues of social justice (Isa 2; Amos); it can tell new covenant believers to do good to all human beings, especially to those of the household of faith (Gal 6); it exhorts us to remember the poor and to ask, not “Who is my neighbor?” but “Whom am I serving as neighbor?” We may even argue that some such list of moral commitments is a necessary consequence of the gospel. But it is not the gospel. We may preach through the list, reminding people that the Bible is concerned to tell us not only what to believe but how to live. But we may not preach through that list and claim it encapsulates the gospel. The gospel is what God has done, supremely in Christ, and especially focused on his cross and resurrection.
Failure to distinguish between the gospel and all the effects of the gospel tends, on the long haul, to replace the good news as to what God has done with a moralism that is finally without the power and the glory of Christ crucified, resurrected, ascended, and reigning” (D.A. Carson; Themelios, Volume 34, Issue 1, April 2009; emphasis mine).