31 He endued with wisdom the soul of Daniel, that young as he was he should become a judge of Elders. The chaste Susanna was condemned as a wanton; there was none to plead her cause; for who was to deliver her from the rulers? She was led away to death, she was now in the hands of the executioners. But her Helper was at hand, the Comforter, the Spirit who sanctifies every rational nature. Come hither to me, He says to Daniel; young though thou be, convict old men infected with the sins of youth; for it is written, God raised up the Holy Spirit upon a young stripling; and nevertheless, (to pass on quickly,) by the sentence of Daniel that chaste lady was saved.
We bring this forward as a testimony; for this is not the season for expounding. Nebuchadnezzar also knew that the Holy Spirit was in Daniel; for he says to him, O Belteshazzar, master of the magicians, of whom I know, that the Holy Spirit of God is in you. One thing he said truly, and one falsely; for that he had the Holy Spirit was true, but he was not the master of the magicians, for he was no magician, but was wise through the Holy Ghost. And before this also, he interpreted to him the vision of the Image, which he who had seen it himself knew not; for he says, Tell me the vision, which I who saw it know not. You see the power of the Holy Ghost; that which they who saw it, know not, they who saw it not, know and interpret.
Source: Catechetical Lectures (New Advent)