To succeed, you must have tremendous perseverance, tremendous will. I will drink the ocean, says the persevering soul; at my will mountains will crumble up. Have that sort of energy, that sort of will; work hard, and you will reach the goal.
Vedânta philosophy : Lectures by the Swâmi Vivekânanda on Râja Yoga (1899), Ch. VI : Pratyâhâra and Dhâraṇâm