Demeter is the food bringer, the law bearer, the mark of agriculture upon civilized society. She's not to be trifled with. She is in charge. I imagine her as a goddess who provides swift punishment if her strict rules are not carried out to her exacting specifications. Don't bite the hand that feeds you.
A quatern is a French form with a refrain. 16 lines of 4 quatrains. Each line is 8 syllables. The first line serves as the refrain and migrates to the second line in the second quatrain, the third in the third, and the fourth and last line in the fourth. There are no particular rules for rhyme or meter. Play with it, and post your results in the comments section so I too can enjoy the fruits of your labor!