Described by Moo as "love and its manifestations", verses 9–21 are proverbial in tone, a style known as . Some verses echo the
Old Testament, notably 16c, 19c, and 20, while others are reflections of Jesus' teachings (especially 14, 17, 18 and 21).
William Barclay suggests that in verses 9 to 13, "Paul presents his people with [twelve] telegraphic rules for everyday life".
Verses 17–21 Verses 17–21 form a
chiasm, bracketed by lines containing the word "evil" – verse 17a and verse 21. The next layer comprising verses 17b–18 and verse 20, deals with the way to treat non-Christians. The central portion is the prohibition of vengeance. Paul's instruction here is not to be
vengeful:
John Wycliffe and his colleagues
translated it as "not defending yourselves" (Romans 12:19).
Verse 21 This verse is a comprehensive summary of Romans 12:19–20, that is, "be not carried away to revenge and retaliation (verse 19) by evil which is committed against
you, but overcome the evil by the good which
you show to
your enemy (verse 20), put to shame by
your noble spirit, ceases to act malignantly against
you and becomes
your friend". ==See also==