Letter 117

Isidore of PelusiumUnknown|isidore pelusium
From: Isidore of Pelusium, monk
To: An unnamed teacher
Date: ~410 AD
Context: Isidore on the two essential qualities of a good teacher.

I believe with all my strength that a teacher needs two things: purity of life and competence in speech. If someone were to define speech as a shadow of deeds, I would not think them far from the truth. The first quality corrects the student; the second restrains the disobedient. Just as writing teachers take up a stylus and trace the letters before the students copy them, so the teacher of virtue must first live the lesson and then speak it. Teaching that does not begin in the teacher's own life has no authority at all.

Modern English rendering for readability. See the 19th-century translation or original Latin/Greek for scholarly use.