From the prologue of the commentary on Isaiah by Saint Jerome, priest
(Nn. 1. 2: CCL 73, 1-3)
I interpret as I should, following the command of Christ: Search the Scriptures, and Seek and you shall find. Christ will not say to me what he said to the Jews: You erred, not knowing the Scriptures and not knowing the power of God. For if, as Paul says, Christ is the power of God and the wisdom of God, and if the man who does not know Scripture does not know the power and wisdom of Gods, then ignorance of Scripture is ignorance of Christ.
Therefore, I will imitate the head of a household who brings out of his storehouse things both new and old, and says to his spouse in the Song of Songs: I have kept for you things new and old, my beloved. In this way permit me to explain Isaiah, showing that he was not only a prophet, but an evangelist and an apostle as well. For he says about himself and the other evangelists: How beautiful are the feet of those who preach good news, of those who announce peace. And God speaks to him as if he were an apostle: Whom shall I send, who will go to my people? And he answers: Here I am; send me.
You can read more about this cantankerous saint HERE, HERE and HERE.