Who said "The past cannot be changed, only learned from."?

This quote is attributed to Theon Greyjoy.

The past cannot be changed, only learned from. - Theon Greyjoy

"The past cannot be changed, only learned from."

Theon Greyjoy Wisdom

"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."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."