[At Pentecost Peter] intendeth to prove…that the Church can be repaired by no other means, saving only by the giving of the Holy Spirit. Therefore, forasmuch as they did all hope that the restoring drew near, he accuseth them of sluggishness, because they do not once think upon the way and means thereof. And when the prophet saith, “I will pour out,” it is, without all question, that he meant by this word to note the great abundance of the Spirit….when God will briefly promise salvation to his people, he affirmeth that he will give them his Spirit. Hereupon it followeth that we can obtain no good things until we have the Spirit given us.
–Commentary on the Acts of the Apostles