Didymus the Blind, on 1Pet 2:9

“But you are a chosen generation, a kingly priesthood, a holy nation, a purchased people: that you may declare his virtues, who hath called you out of darkness into his marvellous light:”

“Under the old dispensation, the priesthood and the kingship were two different things. No one could be both a king and a priest. But afterwards came the gospel, which united these two offices in Christ. From this it follows that the people whom he has chosen will be both royal and priestly at the same time. Some people wonder how it is possible, seeing that we are called from all the nations on earth, for us to be regarded as one holy people. The answer to this is that although we are from many different nations, the fact that we have all repented of our sins and accepted a common will and a common mind gives those who have repented one doctrine and one faith. When there is a soul and heart common to all believers, then they are called one people.”

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