He next gives a persuasive turn to his address, adding, "For the promise is unto you": for he had spoken of a promise above. "And to your children," he says: the gift is greater, when these are to be heirs of the blessings. "And to all," he continues, "that are afar off:" if to those that are afar off, much more to you that are near: "even as many as the Lord our God shall call." Observe the time he takes for saying, "To those that are afar off." It is when he finds them conciliated and self-accusing. For when the soul pronounces sentence against itself, no longer can it feel envy.
"The promise," i.e. the gift of the Holy Ghost. So far, he speaks of the easy part, and that which has with it a great gift; and then he leads them to practice: for it will be to them a ground of earnestness, to have tasted already of those so great blessings.
And you will receive the gift of the Holy Spirit. For the promise is to you and to your children, as the Lord says through the prophet: I will pour out My Spirit on all flesh, and your sons and your daughters shall prophesy (Joel II). And what he added: And to all who are afar off, as many as the Lord our God shall call, refers to that final testimony placed from the prophet, that everyone who calls upon the name of the Lord shall be saved (Ibid.). This particularly pertains to the calling of the Gentiles, who were far removed from the fellowship of the sons of Israel in both kinship and merit, and yet were to be saved by invoking the name of the Lord according to the prophet’s promise.
[AD 407] John Chrysostom on Acts 2:39