I teach in classrooms where, ten years ago, I sat as a student. People who were my teachers are now my colleagues. People who were my students are still my friends. The difference between teacher and student, it seems to me, is more appropriately described as progression through a life than as distinct positions in a hierarchy.
Whitman, Christina B. "Thoughts on Teaching." U. Mich. J. L. Reform 18 (1985): 267-72.