Augustine of Hippo : But notice how it happened there and how it happened here. There, the people stood a long way off; there was an atmosphere of dread, not of love. I mean, they were so terrified that they said to Moses, "Speak to us yourself, and do not let the Lord speak to us, lest we die." So God came down, as it is written, on Sinai in fire; but he was terrifying the people who stood a long way off, and "writing with his finger on stone," not on the heart.Here, however, when the Holy Spirit came, the faithful were gathered together as one; and he didn't terrify them on a mountain but came in to them in a house. There came a sudden sound, indeed, from heaven, as of a fierce squall rushing upon them; it made a noise, but nobody panicked. You have heard the sound, now see the fire too, because each was there on the mountain also, both fire and sound; but there, there was smoke as well, here, though, the fire was clear. "There appeared to them," Scripture says, you see, "divided tongues, as of fire." Terrifying them from a long way off? Far from it. Because "it settled upon each one of them, and they began to talk in languages, as the Spirit gave them utterance." Hear a person speaking a language, and understand the Spirit writing not on stone but on the heart. — SERMON 155.6