Bonaventure, on Acts 2:3

“And there appeared to them parted tongues as it were of fire, and it sat upon every one of them:”

“At first He had given the Holy Spirit to the world in a secret way, but He did it manifestly after He had ascended on high, for this Holy Spirit was the cleansing, enlightening, and perfecting Hierarch, and the Holy Spirit came down into the heavenly and sub-heavenly hierarchies. And so, "suddenly there came a sound from heaven, as of a violent wind." The Holy Spirit came down as a means of cleansing: hence, the "violent wind"; as a means of instruction, hence "there appeared to them parted tongues as of fire"; as a means of perfection, hence the tongues of fire "settled upon each of them." From Him come forth the free gifts of grace.”

Imported from an open dataset — not yet checked against the printed edition.