II.7. Presbyters.
(1) The order of presbyters received its origin, as it has been said, from the sons of Aaron. For those who were called priests in the Old Testament, it is these who are now named presbyters, and those who were called chief priests are now called bishops. "Elders," however, is translated as "presbyters," because the the elders by age are called by the Greeks "presbytes."
To presbyters, as to bishops, the dispensation of the mysteries of God has been committed. (2) For they preside over the churches of Christ and are partners with the bishops in the confecting of the divine body and blood, similarly also in teaching the people and in the office of preaching. By reason of authority, the ordination and consecration of clerics is reserved solely to the bishop, lest, the discipline of the church being claimed by many, it might loosen the concord and generate scandals. Paul the apostle asserted that those presbyters, under the name of bishops, are truly priests when he says to Titus: "I left you behind in Crete for this reason, so that you should put in order what remained to be done, and should appoint elders in every town, as I directed you: someone who is blameless, married only once, whose children are believers, not accused of debauchery and not rebellious. For a bishop... must be blameless" [Titus 1:5-7]. By this statement he showed that presbyters also are to be classified under the name of bishops. (3) And when he wrote to Timothy about the ordination of the bishop and the deacon [see 1 Tim 3:1-13], he was totally silent about presbyters, because he included them in the name of bishops. For the presbyterate is a second and almost joined grade, as he also wrote to the Philippians "[with their] bishops and deacons" [Phil 1:1], since it is not possible that one city would have many bishops. Also in Acts, about to go to Jerusalem, he gathered the presbyters of the church and said to them among other things: "Keep watch over the flock, of which the Holy Spirit has ordained you bishop" [Acts 20:28]. And that such presbyters in the church have been constituted to be just like bishops, both the apostle says to Titus [see Titus 1:6], and the canons themselves testify.
(4) Presbyters are named such, however, by merit and wisdom, not by age. For Moses also was directed to choose presbyters. Whence it is also said in Proverbs: "the beauty of the aged is their grey hair" [Prov 20:29]. What is the grey hair? There is no doubt that it is wisdom, about which it is written: "the grey hair of men is discretion" [Wis 4:8]. When we read [Gen 5:27] that men from Adam up to Abraham had lived more than nine hundred years, no other person is first called presbyter, that is, elder, except Abraham, who is proven to have lived far fewer years. Therefore presbyters are named not on account of decrepit old age but on account of wisdom. And if this is so, it is a wonder why they are constituted foolish.
(trans. Knoebel 2008: 77-78, slightly adapted)