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If half an onion is black with rot, it is a rotten onion. A man is good or he is evil. (Melisandre of Asshai)

George R. R. Martin (2012). “George R. R. Martin's A Game of Thrones 5-Book Boxed Set (Song of Ice and Fire Series): A Game of Thrones, A Clash of Kings, A Storm of Swords, A Feast for Crows, and and A Dance with Dragons”, p.1164, Bantam
If half an onion is black with rot, it is a rotten onion. A man is good or he is evil. (Melisandre of Asshai)