III. The triumph of the Cross is immediate and effective
The Cross of Christ, therefore, symbolizes the true altar of prophecy, on which the oblation of man's nature should be celebrated by means of a salvation-bringing Victim. There the blood of the spotless Lamb blotted out the consequences of the ancient trespass: there the whole tyranny of the devil's hatred was crushed, and humiliation triumphed gloriously over the lifting up of pride: for so swift was the effect of Faith that of the robbers crucified with Christ, the one who believed in Christ as the Son of God entered paradise justified. Who can unfold the mystery of so great a boon? Who can state the power of so wondrous a change? In a moment of time the guilt of long evil-doing is done away; clinging to the cross, amid the cruel tortures of his struggling soul, he passes over to Christ; and to him, on whom his own wickedness had brought punishment, Christ's grace now gives a crown.
Source: Sermons (New Advent)