Edgar Lee Masters - Roger Heston

Oh many times did Ernest Hyde and I
Argue about the freedom of the will.
My favorite metaphor was Prickett's cow
Roped out to grass, and free you know as far
As the length of the rope.
One day while arguing so, watching the cow
Pull at the rope to get beyond the circle
Which she had eaten bare,
Out came the stake, and tossing up her head,
She ran for us.
"What's that, free-will or what?" said Ernest, running.
I fell just as she gored me to my death.

Edgar Lee Masters

http://www.poemhunter.com/poem/roger-heston/