According to Flavius Josephus, Joseph Caiaphas was appointed high priest by the authority of the proconsul of Judea, Valerius Gratus, Pilate's immediate predecessor.
During twelve years of his proconsulship, from A.D. 15 to 27, Valerius Gratus replaced four high priests: Ananias, Ishmael, Eleazar, and Simon, the predecessor of Caiaphas.
The high priesthood had long since lost its important significance. Both the Idumean kings and the Roman proconsuls appointed Jewish high priests quite arbitrarily by their own authority, most often because of bribery.
Nevertheless, the high priest, though unworthy, was a servant of God. He stood before God in prayer for the people, vested in sacred garments, and was an instrument of God. For "there is no authority except from God" (Rom 13:1).
Therefore God was pleased to choose him so that, through his mouth, as the representative of the Jewish people, a prophecy would be uttered, though unconsciously. It concerned the meaning for all men of the coming death of our Lord Jesus Christ.
"It is expedient," says the high priest, "that one man should die for the people (λαός), and not that the whole nation (ἔθνος) should perish."
By the word λαός, people, are meant the individual persons who compose the multitude. But ἔθνος means the structure of state life, the totality of the people as a distinct tribe and race.
In this sense ἔθνος is also used of all other peoples. "The first of the nations is Amalek," ἀρχὴ ἐθνῶν Ἀμαλὴκ, it says in Num 24:20. Compare the still more general use in Gen 10:32.
In this saying of Caiaphas, however, λαός, according to the speaker's understanding, meant exclusively the people of Israel, the chosen people. Yet in the prophecy he unconsciously uttered, this word received an all-embracing human meaning, incomprehensible to Caiaphas himself.
The Evangelist explains this, saying that Caiaphas uttered a prophecy: the Lord Jesus was pleased to die for the people, "and not for the people only," in the sense Caiaphas understood, "but also to gather into one the scattered children of God."
The prophecy spoken by Caiaphas is striking. It shows how the very enemies of the Lord were instruments of God for the glorification of God Incarnate and for the establishment of faith in the Crucified One, "who bore our sins and infirmities and sicknesses."