Yoga gives firmness of body, clarity of intelligence, cleanness of heart. That is peace, and by looking at that peace, others will learn. Cultivate that supreme strength of peace, joy and delight. Then others, seeing the joy in you, will say, ‘I want to enjoy too.’ You are a true helper of society when the pupil comes to you, instead of you going to him. Then it is a pure teaching and a pure message.
~B.K.S. Iyengar from The Tree of Yoga