Therefore when she was led to be put to death, the Lord raised up the holy spirit of a young youth whose name was Daniel:
All Commentaries on Daniel 13:45 Go To Daniel 13
Jerome
AD 420
By this language it is shown that the Holy Spirit did not then enter into Daniel, but rather that He was already within him, and only because of the tenderness of his years He had remained inactive. Nor could He show forth His works until an occasion arose and the Lord stirred him up on behalf of the holy woman.