Who said "The best lessons come from the worst mistakes."?

This quote is attributed to Theon Greyjoy.

The best lessons come from the worst mistakes. - Theon Greyjoy

"The best lessons come from the worst mistakes."

Theon Greyjoy Education

"I am the Prince of Winterfell. I have no need to prove myself to anyone."

"What is dead may never die."

"You can't marry her. You're promised to me."

"I'm a Greyjoy. We do not sow."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."