Chiasmus
Chiasmus is a rhetorical device in which two or more clauses are balanced against each other by the reversal of their structures in order to produce an artistic effect.
Chiasmus is a special form of parallelism that flips the original form around.
Ex: It is completely human to err, but to forgive is divine.
Revision: To err is human, to forgive divine.
Chiasmus is really to express one main point and then express that same point as if it's a completely different matter. This can further impact the statement one is making.
Dr. Seuss expresses chiasmus in a famous quote of his.
Ex: Those who matter don't mind and those who mind won't matter.
Chiasmus come from the Greek work chi meaning X. This is because of the method one can use to preform chiasmus the right way.
Ex: Never let a Fool Kiss You or a Kiss Fool You.
Revision: never let a kiss fool you or a fool kiss you.