This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...s life, man is free to think or to evade that effort. Thinking requires a state of full, focused awareness. The act of focusing one’s consciousness is volitional. Man can focus his mind to a f
ull, active, purposefully directed awareness of reality — or he can unfocus it and let himself drift in a semiconscious daze, merely re- acting to any chance stimulus of the immediate moment,
at the mercy of his undirected sensory-perceptual mechanism and of any random, associational connections it might happen to make.
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When man unfocuses his mind, he may be said to be ...