Have you ever noticed that God and Good are similar words. What about Evil and Devil? I don't think it is coincidence. God is an example of all that is good. The devil is an example of all that is evil.
Psalm 25:8 (KJV) says:
Good and upright is the LORD: therefore will he teach sinners in the way.
He shows us the good path, although it is narrow. Jesus is our example. He was able to live a life here on earth without sinning, something no one else has been able to do or will ever be able to do! So, if you want to know what is good, seek to know what God's will is!