Challenge Response: Why Is Good "Good"?

My response to this week's challenge:  

 

If you're interested in going deeper on this topic, here is some additional reading: 

God, Naturalism, and the Foundations of Morality by Paul Copan
Can Michael Martin Be a Moral Realist?: Sic et Non by Paul Copan
Euthyphro Dilemma | Reasonable Faith
The Euthyphro Dilemma Once More | Reasonable Faith