I think it is most important for a teacher to play the pieces and studies that are being played by the student.
I have a specialized racing bike, which is great because it has a solid build, is comfortable to ride, and is lightweight.
So as long as I'm a working actor, I can improve. I want to work with people that frighten me and excite me, and characters that I don't believe I'm the best person for the part but I'm still gonna try anyway. Those are my favorite roles.