Theodoret of Cyrus: Christ Highpriest as Sole Mediator

He resumes the treatment of the highpriesthood. Having become a highpriest forever according to the order of Melchizedek. He took this from the inspired testimony, "You are a highpriest forever according to the order of Melchizedek." He is a highpriest forever, not in offering sacrifices (having offered his own body once), but in being a mediator leading the believers to the Father; through him (he says, remember) we have both had access to the Father. The Lord himself says in the sacred Gospels, "No one comes to the Father except through me."

- Theodoret of Cyrus (around A.D. 393 to around A.D. 457), Commentary on Hebrews, Chapter 6, in Theodoret of Cyrus, Commentary on the Letters of St. Paul, Volume 2, p. 162 (2001), Robert C. Hill translator.