A teacher affects eternity: he can never tell where his influence stops.
~ Henry Adams

A teacher is one who makes himself progressively unnecessary.
~ Thomas Carruthers

If you want to be a teacher, remember that you’re just as likely to teach who you are as you are to teach what you know.
~ Marie T. Freeman

Enseigner, c’est apprendre deux fois. [To teach is to learn twice.]
~ Joseph Joubert, in Pensees