Note 44 — BOOK II THE LIFE OF A CHRISTIAN IN THE EARLY DAYS OF THE FAITH
Reading edition
The quotation referred to is from the so-called 2nd Epistle of Clement of Rome (section 2), which Harnack attributes to Soter, bishop of Rome. Lightfoot, however, places the Epistle even earlier (circa A.D. 140), and considers it the work of an anonymous writer.