Theodoret of Cyrus: Christ's Sacrifice was Once for All

Then he puts fear into them with mention of the judgement. If we willingly sin after receiving the knowledge of the truth, sacrifice for sins is no longer available - instead, some fearful expectation of judgement and a raging fire ready to consume the adversaries (vv.26-27). Now, it was not that he was ruling out repentance in these statements; rather, he was claiming that there is no second sacrifice: our Lord was immolated for us once and for all.

- Theodoret of Cyrus (around A.D. 393 to around A.D. 457), Commentary on Hebrews, Chapter 10, in Theodoret of Cyrus, Commentary on the Letters of St. Paul, Volume 2, p. 179 (2001), Robert C. Hill translator.