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The Persian Literature, Comprising The Shah Nameh, The...

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He can see no good who will associate with the wicked:—Were an angel from heaven to associate with a demon, he would learn his brutality, perfidy, and hypocrisy. Virtue thou never canst learn of the vicious; it is not the wolf's occupation to mend skins, but to tear them.

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The Persian Literature, Comprising The Shah Nameh, The Rubaiyat, The Divan, and The Gulistan, Volume 2, Project Gutenberg eBook #13060

XXXIX XLI