I don't think they can change their minds. When you get to that level of power and knowledge and perfection, the question of what you should do next … - Lev Grossman

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I don't think they can change their minds. When you get to that level of power and knowledge and perfection, the question of what you should do next gets increasingly obvious. Everything is very rule-governed. All you can ever do in any given situation is the most gloriously perfect thing, and there's only one of them. Finally there aren't any choices left to make at all."
"You're saying the gods don't have free will."
"The power to make mistakes," Penny said. "Only we have that. Mortals.