I've started to read a book by Gloria Durka, The Teacher's Calling: A Spirituality for Those Who Teach (Mahwah, NJ: Paulist Press, 2002). I want to keep thinking about some of her ideas, but I like this quote to start with (page 57; emphasis in text).
"Everything we do as teachers has moral implications. Through dialogue, modeling, practice and the assignment of best motive, a caring teacher nurtures the ethical idea. What we reflect to our students contributes to the enhancement of that ideal if we meet our students as they are and find something admirable in them. As a result of this confirmation, our students may find the strength to become even more admirable. We leave them with an image that is lovelier than the one they had of themselves. We do not need to establish a deep, lasting, time-consuming personal relationship with every student. What we must do is to be present to each student as she or he addresses us.
"In sum, to teach morally, we need to care."