This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...lty that identifies and integrates the material provided by man’s senses. It is a faculty that man has to exercise by choice. Thinking is not an automatic function. In any hour and issue of hi 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, ...
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