Self-Contained

I think I could turn and live with the animals,
They are so placid and self-contained.
I stand and look at them, and long, and long.
They do not sweat and whine about their own condition,
They do not lie awake in the dark and weep for their sins,
They do not make me sick discussing their duty to God;
Not one is dissatisfied not one is demented with the
  mania of owning things;
Not one kneels to another, nor to his kind that lived
  thousands of years ago.
Not one is respectable and unhappy over the whole earth.