Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power. It is not the brain but in the heart that the Atman, possessed of knowledge, power, and activity, has Its seat….The more heart you will be able to manifest, the greater will be the victory you achieve.
(p.425, Vol.6, Complete Works of Swami Vivekananda, Swamiji in his letter to Swami Akhandananda from California on 21 Feb, 1900)