We're all of us guinea pigs in the laboratory of God. Humanity is just a work in progress.

-Williams,TennesseeThomas Lanier
  The Gipsy. Camino Real, block12.

To strive for perfection is to kill love because perfection does not recognize humanity.

-Woodman, Marion
  Addition to Perfection:The Still Unravished Bride.

For I have learned To look on nature, not as in the hour Of thoughtless youth; but hearing often-times The still, sad music of humanity, Nor harsh nor grating, though of ample power To chasten and subdue. And I have felt A presence that disturbs me with the joy Of elevated thoughts; a sense sublime Of something far more deeply interfused, Whose dwelling is the light of setting suns, And the round ocean and the living air, And the blue sky, and in the mind of man.

-Wordsworth,William
  'Lines composed a few miles aboveTintern Abbey, on revisiting the banks of theWye', l.88^99.