John 18:14
“Now Caiaphas was he which gave counsel to the Jews, that it was expedient that one man should die for the people.”
Why does the Evangelist again remind us of his prophecy? To show that these things were done for our salvation. And such is the exceeding force of truth, that even enemies proclaimed these things beforehand. For lest the listener, hearing of bonds, should be confounded, he reminds him of that prophecy, that the death of Jesus was the salvation of the world.
Source: Homilies on the Gospel of John (New Advent)