Amos describes the Israelites as proud and secure in their special relationship with God, while God castigates them for presuming He approved of them.
God turns His face away from those who have committed sin. Our entire spiritual pilgrimage is a quest to see God's face in full splendor (Revelation 22:1-5).
In terms of building character, God does the creating, assaying, testing, and proving; we do the yielding and walking in the pathway He has set for us.
Because the heart represents what and who we are and how we conduct our lives, the condition of our spiritual heart is of the utmost importance to us.
The best way to conquer evil is to do righteousness, serving God and mankind. Sins of omission are every bit as devastating as sins of commission.