Ambrose of Milan

In his own words on Joel

• Joel 2:11

  He also very cleverly called one day not the first; for the following second, and third day, and thereafter the rest, he could have called the first: and this seemed to be an order, but he established a law, that only twenty-four hours of daylight and darkness should be defined by name for one day, so that if he were to say: "The measure of twenty-four hours is the time of one day." Just as the generation of men is computed, and the generation of women is also understood, because they are connected with the second and superior; so also the days are counted, and the nights are assessed as attached. Just as there is one circle, so there is one day. For many also call one week one day; because it returns to itself as if it were one day, and as if it were recurring seven times within itself. And this circle begins from itself and returns to itself. Therefore, at times, the Scriptures call it one age. For although it uses the term age in other places, it seems to signify more the diversities of public states or affairs rather than define any successions of ages: "Because the day of the Lord is great and very glorious." And elsewhere, "Why are you seeking the day of the Lord?" And here there is darkness and not light. For it is clear that for those with a guilty conscience and unworthy, that day will be dark, in which innocence will shine, and the guilty mind will be tormented. Moreover, without the interruption of nights and the succession of darkness, Scripture teaches us that that perpetual day will be the future of eternal retribution.

  The Six Days of Creation 1.10.37

• Joel 2:28-29

  But of what creature can it be said that it fills all things, as is written of the Holy Spirit: "I will pour My Spirit upon all flesh." This cannot be said of an Angel. Lastly, Gabriel himself, when sent to Mary, said: "Hail, full of grace," plainly declaring the grace of the Spirit which was in her, because the Holy Spirit had come upon her, and she was about to have her womb full of grace with the heavenly Word.

  On the Holy Spirit 1.7.85

• Joel 2:28-29

  But that the Spirit is the Arbiter of the Divine Counsel, you may know even from this. For when above we showed that the Holy Spirit was the Lord of baptism, and read that baptism is the counsel of God, as you read, "But the Pharisees despised the counsel of God, not being baptized of Him," it is quite clear that as there can be no baptism without the Spirit, so, too, the counsel of God is not without the Spirit. And that we may know more completely that the Spirit is Power, we ought to know that He was promised when the Lord said: "I will pour out of My Spirit upon all flesh." He, then, Who was promised to us is Himself Power, as in the Gospel the same Son of God declared when He said: "And I will send the promise of the Father upon you, but do you remain in the city until ye be endued with power from on high."

  On the Holy Spirit 2.2.21-22

• Joel 2:32

  Return, then, to the Church, those of you who have wickedly separated yourselves. For He promises forgiveness to all who are converted, since it is written: "Whosoever shall call on the Name of the Lord shall be saved." And lastly, the Jewish people who said of the Lord Jesus, "He hath a devil," and "He casteth out devils through Beelzebub," and who crucified the Lord Jesus, are, by the preaching of Peter, called to baptism, that they may put away the guilt of so great a wickedness.

  Concerning Repentance, Book 2, Chapter 4.26