The gospel of Christ in general is this: It is the good tidings that God has revealed concerning Christ. More largely it is this: As all mankind was lost in Adam and became the children of wrath, put under the sentence of death, God, though He left His fallen angels and has reserved them in the chains of eternal darkness, yet He has thought upon the children of men and has provided a way of atonement to reconcile them to Himself again...Namely, the second person of the Trinity takes man's nature upon Himself, and becomes the Head of a second covenant, standing charged with sin. He answers for it by suffering what the law and divine justice required, and by making satisfaction by keeping the law perfectly, which satisfaction and righteousness He tenders up to the Father as a sweet savor of rest for the souls 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 atonement unto sinners for atonement, 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 those who shall have the image of God again to be renewed unto them, and they they shall be kept by the power of God through faith unto salvation.
To believe the gospel is a task far, far beyond the poor resources of corrupt human nature (1 Cor 2:14, John 6:65).
...and Heaven have mercy on us all - Presbyterians and Pagans alike - for we are all dreadfully cracked about the head and desperately in need of mending.
Herman Melville Moby Dick
We must not suppose that if we succeeded in making everyone nice we should have saved their souls. A world of nice people, content in their own niceness, looking no further, turned away from God, would be just as desperately in need of salvation as a miserable world.
We must have the full message. . . 'deliver the whole counsel of God'. . . . It starts with the Law. The Law of God ... the demands of a righteous God, the wrath of God. That is the way to bring men and women to conviction; not by modifying the Truth.... We must confront them with the fact that they are men and that they are fallible men, that they are dying men, that they are sinful men, and that they will all have to stand before God at the Bar of Eternal Judgement....And then we must present to them the full-orbed doctrine of the Grace of God in Salvation in Jesus Christ. We must show that no man is saved 'by the deeds of the Law', by his own goodness or righteousness, or church membership or anything else, but solely, utterly, entirely by the free gift of God in Jesus Christ His Son. . . . We must preach the full-orbed doctrine leaving nothing out-conviction of sin, the reality of Judgement and Hell, free grace, justification, sanctification, glorification. We must also show that there is a world view in the Bible ... that here alone you can understand history-past history, present history, future history. Let us show this great world view, and God's Eternal purpose.... Let us at the same time be very careful that we are giving it to the whole man ... the gospel is not only for a man's heart, that you start with his head and present Truth to it ... Let us show that it is a great message given by God which we in turn pass on to the mind, to the heart, to the will. There is ever this danger of leaving out some part or other of man's personality... Let us be certain that we address the whole man-his mind, his emotions and his will.
D. Martyn Lloyd-Jones The Weapons of our Warfare pg. 21-22