This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...conscious in a subhuman sense of the word, since he experiences sensations and perceptions. But in the sense of the word applicable to man — in the sense of a consciousness which is aware of r eality and able to deal with it, a con- sciousness able to direct the actions and provide for the survival of a human being — an unfocused mind is not conscious.

Psychologically,
the choice “to think or not” is the choice “to focus or not.” Existentially, the choice “to focus or not” is the choice “to be conscious or not.” Metaphysically, the choice “t...
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