We can see it in its effects. It is the greatest motive power that moves the human mind. No other ideal can put into us the same mass of energy as the spiritual. So far as human history goes, it is obvious to all of us that this has been the case and that its powers are not dead.
- Swami Vivekananda
( Delivered in London )The Complete Works of Swami Vivekananda/Volume 2/Jnana-Yoga/The Necessity of Religion