This episode elaborates on the great exchange of Romans 1:18-23, in which mankind exchanges the glory of God for an image in the form of himself. This exchange is critical to understanding unbelievers' basis for doing good works. Morality and "good works" are ultimately defined by the object they serve. Mankind is the fundamental god of unbelievers and "good works" describe the relationship of man's works to man's god, i.e. himself. So not surprisingly, man commends himself when his works serve himself, even calling his evil works "good." Isaiah commented on the disconnect between divine morality and man-made morality: "woe to those who call evil good, and good, evil." (Is 5:20) The last part of the episode explains how the great exchange is reversed by following Christ.
