If the Bible makes anything clear, it is the fact that the secret of all Godβs good news to men is centered in Calvary. It was because Christ was to die for sin that God could proclaim good news to sinners down through the ages.
It was not until some time after the crucifixion, however, that βthe preaching of the crossβ was widely proclaimed as a message by Paul in βthe gospel [good news] of the grace of Godβ (I Cor. 1:18; Acts 20:24).
The proclamation of βthe gospel of the grace of Godβ was the natural accompaniment to the revelation of the cross as the secret of Godβs good news to man. In this proclamation of His over-abounding grace to sinners, everything centers in the cross.
According to Paulβs epistles βwe have redemption through His [Christβs] bloodβ (Eph. 1:7), we are βjustified by His bloodβ (Rom. 5:9), βreconciled to God by the death of His Sonβ (Rom. 5:10), βmade nigh by the blood of Christβ (Eph. 2:13), and βmade the righteousness of God in Himβ because βGod hath made Him to be sin for usβ (II Cor. 5:21).
The βcovenantβ of the Law was abolished by the cross (Col. 2:14), the curse of the Law was removed by the cross (Gal. 3:13), the βmiddle wall of partitionβ was broken down by the cross (Eph. 2:14,15), and believers in Christ are βreconciled to God in one body by the crossβ (Eph. 2:16). Little wonder Paul calls this message βthe preaching of the crossβ!
To the believers it is thrilling indeed, and how thankful we should be, to see the cross as Godβs reply to Satan when, at first glance, it had appeared that the cross was Satanβs greatest triumph. source