„Only to the rational animal is it given to follow voluntarily“

— Marcus Aurelius

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„Animals can be driven crazy by placing too many in too small a pen. Homo sapiens is the only animal that voluntarily does this to himself.“
— Robert A. Heinlein
„Man is not a rational animal; he is a rationalizing animal.“
— Robert A. Heinlein
„This work was strictly voluntary, but any animal who absented himself from it would have his rations reduced by half.“
— George Orwell
„The happiness and unhappiness of the rational, social animal depends not on what he feels but on what he does; just as his virtue and vice consist not in feeling but in doing.“
— Marcus Aurelius