"He who sees in the midst of intense activity, intense calm, and in the midst of intensest peace is intensely active [is wise indeed]......This is the question: With every sense and every organ active, have you that tremendous peace [so that] nothing can disturb you? Standing on Market Street, waiting for the car with all the rush ... going on around you, are you in meditation — calm and peaceful? In the cave, are you intensely active there with all quiet about you? If you are, you are a Yogi, otherwise not.
- Swami Vivekananda
(Delivered in San Francisco, on May 29, 1900)
The Complete Works of Swami Vivekananda/Volume 1/Lectures And Discourses/The Gita III