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Shakespeare, explaining why a certain level of granularity is of value in a taxonomy.
From Macbeth:
1st Murderer: We are men, my lord.
Macbeth: Aye, in the catalogue ye go for men; as hounds, and greyhounds, mongrels, spaniels, curs, shoughs, water-rugs, and demi-wolves are clept all by the name of dogs: the valued file distinguishes the swift, the slow, the subtle, the housekeeper, the hunter, every one according to the gift which bounteous nature hath in him clos’d; whereby he does receive particular addition, from the bill that writes them all alike: and so of men.
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