"Hatha-Yoga... deals entirely with the physical body, its aim being to make the physical body very strong. We have nothing to do with it here, because its practices are very difficult, and cannot be learned in a day, and, after all, do not lead to much spiritual growth... The result of this branch of Yoga is to make men live long; health is the chief idea, the one goal of the Hatha-Yogi. He is determined not to fall sick, and he never does. He lives long; a hundred years is nothing to him; he is quite young and fresh when he is 150, without one hair turned grey. But that is all. A banyan tree lives sometimes 5000 years, but it is a banyan tree and nothing more. So, if a man lives long, he is only a healthy animal. One or two ordinary lessons of the Hatha-Yogis are very useful."

- Swami Vivekananda, "The First Steps" (Dec 14, 1895, New York Vedanta Society), Raja-Yoga, Complete Works: Vol 1