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The differences between a soldier, an artisan, a man of business, a lawyer, an idler, a student, a statesman, a merchant, a sailor, a poet, a beggar, a priest, are as great, though not so easy to define, as those between the wolf, the lion, the ass, the crow, the shark, the seal, the sheep, etc. Thus social species have always existed, and will always exist, just as there are zoological species.
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Honoré de Balzac (Collected Works of Honore de Balzac with the Complete Human Comedy)