This is an old blog from Together for the Gospel, but it contains some great and memorable quotes on the Gospel. Here are some of my favorites:
"There is nothing attractive about the gospel to the natural man; the only man who finds the gospel attractive is the man who is convicted of sin." (Oswald Chambers)
"The gospel is not 'God loves us,' but 'God loves us at the cost of his Son.'" (Derek Thomas)
“One is taken aback by the emphasis upon the Cross in Revelation. Heaven does not ‘get over’ the cross, as if there are better things to think about; heaven is not only Christ-centered, but cross-centered, and quite blaring about it.” (Jim Elliff)
And J.C. Ryle's warnings on how the Gospel is spoiled are well-taken:
“You may spoil the gospel by substitution. You have only to withdraw from the eyes of the sinner the grand object which the Bible proposes to faith--Jesus Christ--and to substitute another object in His place… and the mischief is done.
“You may spoil the gospel by addition. You have only to add to Christ, the grand object of faith, some other objects as equally worthy of honor, and the mischief is done.
“You may spoil the gospel by disproportion. You have only to attach an exaggerated importance to the secondary things of Christianity, and a diminished importance to the first things, and the mischief is done.
“Lastly, but not least, you may completely spoil the gospel by confused and contradictory directions… Confused and disorderly statements about Christianity are almost as bad as no statement at all. Religion of this sort is not evangelical.”