John 19:18

(Tr. cxvi) They, i. e. the soldiers, the guards of the governor, as appears more clearly afterwards; Then the soldiers when they had crucified Jesus; though the Evangelist might justly have attributed the whole to the Jews, who were really the authors of what they procured to be done. (Tr. xxxi. in fin.) Yea, even the cross, if thou consider it, was a judgment seat: for the Judge being the middle, one thief, who believed, was pardoned, the other, who mocked, was damned: a sign of what He would once do to the quick and dead, place the one on His right hand, the other on His left.

The two criminals who hung by Christ's side symbolize the two nations who were about to be brought into close contact with him, namely, the children of Israel and the Gentiles. And why do we take condemned criminals as the type? Because the Jews were condemned by the Law, for they were guilty of transgressing it. And the Greeks were condemned by their idolatry, for they worshiped the creature more than the Creator.… Therefore, the crucifixion of the two robbers, side by side with Christ, signifies … the juxtaposition of the two nations, dying together, as it were, with the Savior Christ by bidding farewell to worldly pleasures, refusing any longer to live after the flesh and preferring to live with their Lord, as far as possible, by fashioning their lives according to him and consecrating them to his service. And the meaning of the figure is in no way affected by the fact that the men who hung by his side were criminals. For we were by nature children of wrath before we believed in Christ and were all doomed to death.

What matter if the Jews did these things with a different intent. They crucified Him too with thieves, in this also unintentionally fulfilling prophecy; for what they did for insult contributed to the truth, that thou mayest learn how great is its power, since the Prophet had foretold of old, that "He was numbered with the transgressors." (Isa. liii. 12.) The devil therefore wished to cast a veil over what was done, but was unable; for the three were crucified, but Jesus alone was glorious, that thou mayest learn, that His power effected all. Yet the miracles took place when the three had been nailed to the cross; but no one attributed anything of what was done to either of those others, but to Jesus only; so entirely was the plot of the devil rendered vain, and all returned upon his own head. For even of these two, one was saved. He therefore did not insult the glory of the Cross, but contributed to it not a little. For it was not a less matter than shaking the rocks, to change a thief upon the cross, and to bring him unto Paradise.