We are creatures that are designed for continual challenge. We must grow or we begin to die....So just standing still isn't really an option. We have to move on. If not, disturbances will come.
B.K.S. IyengarTo do is hard, but to teach is still harder. Do not teach only to teach. Teach to improve the pupil. To be a teacher requires tremendous, vigorous discipline on oneself. We are teachers because somebody demands it from us. But the teacher should first rub his own self, and teach afterwards
B.K.S. Iyengar