The heart of the gospel is redemption, and the essence of redemption is the substitutionary sacrifice of Christ. They who preach this truth preach the gospel in whatever else they may be mistaken; but they who preach not the atonement, whatever else they declare, have missed the soul and substance of the divine message.
Charles SpurgeonSelf-righteousness exclaims, "I will not be saved in God's way; I will make a new road to heaven; I will not bow before God's grace; I will not accept the atonement which God has wrought out in the person of Jesus; I will be my own redeemer; I will enter heaven by my own strength, and glorify my own merits." The Lord is very wroth against self-righteousness. I do not know of anything against which His fury burneth more than against this, because this touches Him in a very tender point, it insults the glory and honor of His Son Jesus Christ.
Charles Spurgeon