chiasmus [kaɪˈæzməs] n.
1.) Rhetoric. The arrangement of adjoining parallel clauses or phrases with inverted word order. Normally, parallel clauses have an "a-b-a-b" arrangement. In chiasmus, the order becomes "a-b-b-a" (Garner's Modern American Usage 3rd Ed.).
Etymology: Modern Latin, adopted from Greek χιασµός crossing, diagonal arrangement, especially of clauses of a sentence, from χιάζ-ειν, to mark with or like a chī (χ).
"Behold, the third time I am ready to come to you; and I will not be burdensome to you: for I seek not yours, but you: for the children ought not to lay up for the parents, but the parents for the children" (2 Corinthians, Paul of Tarsus, ~55).
I actually may have to discuss this one in my thesis.