Who said "The weak are meat the strong do eat."?

This quote is attributed to Theon Greyjoy.

The weak are meat the strong do eat. - Theon Greyjoy

"The weak are meat the strong do eat."

Theon Greyjoy Strength

Character in A Storm of Swords

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"A man must know what he is."

"A man is defined by his choices."

"I paid the iron price."

"I am Reborn."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."