I’ve been doing a lot copy-editing over the last seven years. This made me laugh:
By nature editors hate error, but by vocation they are called to deal with it daily. And painfully enough, it is sometimes their own.
Daniel G. Reid, “Commentaries and Commentators from a Publisher’s Perspective,” On the Writing of New Testament Commentaries: Festschrift for Grant R. Osborne on the Occasion of His 70th Birthday 
(ed. Stanley E. Porter and Eckhard J. Schnabel; Texts and Editions for New Testament Study 8; Leiden: Brill, 2013), 464.
Reminds me of paper grading. I often have to erase something that I wrote about a student’s error.