Growing up, I watched Saturday morning television cartoons in which a character was making a decision. On one shoulder an angel hovered, saying, "Do the right thing!" But on the other shoulder perched a devil urging the character to do the wrong thing. You already know what happened: as the angel looked increasingly anxious, the cartoon character chose to do the wrong thing. Paul's Galatians didn't watch TV cartoons, but they probably had a similar model of decision making.
Season after Pentecost | 13th Sunday in Ordinary Time (Year C)
2 Kings 2:1-2, 6-14; Psalm 77:1-2, 11-20; (1 Kings 19:15-16, 19-21; Psalm 16;) Galatians 5:1, 13-25; Luke 9:51-62