If you aren't sure what chiasmus means, you have a lot of company.
Chiasmus occurs when the order of words is reversed in parallel expressions.
The value of marriage is not that adults produce children, but that children produce adults. My goal is to bring chiasmus out of the closet of obscurity and move it into the world of popular parlance. If there's a precedent for what I'm trying to do, it's the word oxymoron. Fifty years ago, it was a rare word, known by only a small and select group of people. Today virtually all literate people know what it means.