This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...matically. Man, the highest living species on this earth — the being whose consciousness has a limitless capacity for gaining knowledge — man is the only living entity bom without any guaran
tee of remaining conscious at all. Man’s particular distinction from all other living species is the fact that his consciousness is volitional.
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Just as the automatic values direc
ting the functions of a plant’s body are sufficient for its survival, but are not sufficient for an animal’s — so the automatic values provided by the sensory-perceptual mechanism of its c...