If from one burning lamp someone lights another, then another from that one, and so on in succession, he has light continuously. In the same way, through the Apostles ordaining their successors, and these successors ordaining others, and so on, the grace of the Holy Spirit is handed down through all generations and enlightens all who obey their shepherds and teachers.

St. Gregory Palamas, “On how the Holy Spirit was manifested and shared out at Pentecost”