Atharva

“Take up one idea. Make that one idea your life; dream of it; think of it; live on that idea. Let the brain, the body, muscles, nerves, every part of your body be full of that idea, and just leave every other idea alone. This is the way to success, and this is the way great spiritual giants are produced.”
― Swami Vivekananda, Vedanta Philosophy: Lectures by the Swami Vivekananda on Raja Yoga Also Pantanjali's Yoga Aphorisms, with Commentaries, and Glossary of Sanskrit Terms