Lives and philosophies, as well as spiritual practices advocated by the founders of the major Vaishnava philosophical schools: Ramanuja, Nimbarka, Madhva, Vallabha, and Chaitanya.
My child, what I want is muscles of iron and nerves of steel, inside which dwells a mind of the same material as that of which the thunderbolt is made.
-Swami Vivekananda