Commentary of St. John Chrysostom on the Acts of the Apostles
And when the day of Pentecost was fully come, they were all with one accord in one place. And suddenly there came a sound from heaven." (Acts 2:1-2)
DOST thou perceive the type? What is this Pentecost? The time when the sickle was to be put to the harvest, and the ingathering was made. See now the reality, when the time was come to put in the sickle of the word: for here, as the sickle, keen-edged, came the Spirit down. For hear the words of Christ: "Lift up your eyes," He said, "and look on the fields, for they are white already to harvest." (John iv. 35.) And again, "The harvest truly is great, but the laborers are few." (Matt. ix. 38.) But as the first-fruits of this harvest, He himself took [our nature], and bore it up on high. Himself first put in the sickle. Therefore also He calls the Word the Seed. "When," it says, "the day of Pentecost was fully come" (Luke viii. 5, 11): that is, when at the Pentecost, while about it, in short. For it was essential that the present events likewise should take place during the feast, that those who had witnessed the crucifixion of Christ, might also behold these.
"And suddenly there came a sound from heaven." (v. 2.) Why did this not come to pass without sensible tokens? For this reason. If even when the fact was such, men said, "They are full of new wine," what would they not have said, had it been otherwise? And it is not merely, "there came a sound," but, "from heaven." And the suddenness also startled them, and brought all together to the spot. "As of a rushing mighty wind:" this betokens the exceeding vehemence of the Spirit. "And it filled all the house:" insomuch that those present both believed, and in this manner were shown to be worthy.