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... in the path of knowledge as it is practised in India concentration is used in a special and more limited sense. It means that removal of the thought from all distracting activities of the mind and that concentration of it on the idea of the One by which the soul rises out of the phenomenal into the one Reality. It is by the thought that we dissipate ourselves in the phenomenal; it is by the gathering back of the thought into itself that we must draw ourselves back into the real. <ref>http://incarnateword.in/cwsa/23/concentration#p2. </ref>