Why Do I Teach?

College education is a proliferation of such possibilities: the beauty of mathematical discovery, the thrill of scientific understanding, the fascination of historical narrative, the mystery of theological speculation. We should judge teaching not by the amount of knowledge it passes on, but by the enduring excitement it generates. Knowledge, when it comes, is a later arrival, flaring up, when the time is right, from the sparks good teachers have implanted in their students’ souls.

Gary Gutting, "Why Do I Teach?" The Stone - http://opinionator.blogs.nytimes.com/?p=144567