To Pammachius on the Best Method of Translating
When at a subsequent period Rufinus gave to the world what was in Jerome's opinion a misleading version of Origen's First Principles, he appealed to this letter as giving him ample warranty for what he had done. See Letters LXXX, and LXXXI, and Rufinus' Preface to the περί ᾿Αεχῶν in Vol. iii. of this series.
Source: Letters (New Advent)