Mercy (n.) is a quality which, like soup, the more it is strained the less soup and the more water you have.
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Mercy (n.) is in war a universal mode of subjugating a people.
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Mercy (n.) is the charity of tyrants.
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Mercy (n.) is the culmination of the Will-to-Power and its final apotheosis.
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Mercy (n.) is the forgiveness of one scoundrel by another.