God, the Law-Giver

Greetings to all,

I have been looking for a quote from St. Thomas Aquinas concerning the reality of Evil. It essentially addresses the Eutyphro Dilemma:

Is what is morally good commanded by God because it is morally good, or is it morally good because it is commanded by God?

St. Thomas’ answer was essentially that: something is Evil because God forbids it, but God forbids it because it is Evil.

I would like to know if someone can help me find the exact quote.

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