Homophonia

This is one of those poems that seemed to make sense as I was falling asleep last night, but puzzles me a bit in the cold light of day.  Anyway, here goes.

                                                            Homophonia


                                                      If you listen carefully
                                                      (or is it carelessly?),
                                                      you can hear rouse
                                                      in drowse
                                                      and yearn
                                                      in spurn.
                                                      Sometimes opposites
                                                      embrace and sow
                                                      the seeds of their own
                                                      construction.