Chapter 10 — Part I: The Creed — Article VIII: I Believe in the Holy Ghost
Section 12. In the Acts of the Apostles also what the Prophets attribute to God alone, St. Paul ascribes to the Holy. Ghost. Thus Isaias had said: I heard the voice of the Lord, saying: Whom shall I send? . . . And he said: Go, and thou shalt say to this people: Blind the heart of this people, and make their ears heavy, and shut their eyes, lest they see with their eyes, and hear with their ears. Having cited these words, the Apostle adds: Well did the Holy Ghost speak to our fathers, by Isaias the prophet.