Swami Vivekananda on Concentration
" Concentration is the essence of all knowledge, nothing can be done without it. Ninety per cent of thought force is wasted by the ordinary human being, and therefore he is constantly committing blunders; the trained man or mind never makes a mistake. When the mind is concentrated and turned backward on itself, all within us will be our servants, not our masters. The Greeks applied their concentration to the external world, and the result was perfection in art, literature, etc. The Hindu concentrated on the internal world, upon the unseen realms in the Self, and developed the science of Yoga. Yoga is controlling the senses, will and mind. The benefit of its study is that we learn to control instead of being controlled. Mind seems to be layer on layer. Our real goal is to cross all these intervening strata of our being and find God. The end and aim of Yoga is to realise God. To do this we must go beyond relative knowledge, go beyond the sense-world. The world is awa