Here is a bad odour. It will bring me unhappiness as soon as it touches my nose. I am the slave of my nose. If I am not its slave, I do not care. A man curses me. His curses enter my ears and are retained in my mind and body. If I am the master, I shall say: "Let these things go; they are nothing to me. I am not miserable. I do not bother." This is the outright, pure, simple, clear-cut truth.
The other problem to be solved is — is it practical? Can man attain to the power of mastery of the body? ... Yoga says it is practical .... Supposing it is not — suppose there are doubts in your mind. You have got to try it. There is no other way out....
- Swami Vivekananda
(Delivered in San Francisco, April 5, 1900) The Complete Works of Swami Vivekananda/Volume 1/Lectures And Discourses/Practical Religion: Breathing And Meditation