Catena Aurea on Luke 10:1–2: Augustine of Hippo

As also in twenty-four hours the whole world moves round and receives light, so the mystery of enlightening the world by the Gospel of the Trinity, is hinted at in the seventy-two disciples. For three times twenty-four makes seventy-two. Now as no one doubts that the twelve Apostles foreshadowed the order of Bishops, so also we must know that these seventy-two represented the presbytery, (that is, the second order of priests.) Nevertheless, in the earliest times of the Church, as the Apostolical writings bear witness, both were called presbyters, both also called bishops, the former of these signifying “ripeness of wisdom,” the latter, “diligence in the pastoral care.”