Chiasm in Romans 12.14-21

I think there is a chiastic structure to Paul's instructions to the Romans in their dealings with persecution. My pastor preached on this passage this morning and pointed out that the entire portion is devoted to dealing with unbelievers. I've always thought of it as teaching how believers are to deal with other believers.

A. Bless those who persecute; bless and do not curse them (v. 14).
B. Rejoice with those who rejoice, weep with those who weep (v. 15).
C. Live in harmony with one another. Do not be haughty, but associate with the lowly. Never be conceited (v. 16).
D. Repay no one evil for evil, but give thought to do what is honorable in the sight of all (v. 17).
D'. Never avenge yourselves, but leave it to the wrath of God...(v. 19)
C'. If possible, so far as it depends on you, live peaceably with all (v. 18).
B'. If your enemy is hungry, feed him; if he is thirsty, give him something to drink.... (v. 16).
A'. Do not be overcome by evil, but overcome evil with good (v. 21).

Since Paul brackets the passage with commands about how to handle persecution, the point he seems to be making is in D and D', namely, when you are persecuted by unbelievers, leave it to God to handle. This trust in God's all encompassing and sure justice and vengance frees the believer to love and feed and live peaceably with those who are seeking to do them harm.