"If there's one theme in all my work it's about authenticity and
  self-expression," Williams said in 2002. "It's the idea that
  some things are in some real sense really you, or express what
  you and others aren't ... The whole thing has been about
  spelling out the notion of inner necessity."[6] He moved moral
  philosophy away from the Kantian question, "What is my duty?"
  and back to the issue that mattered to the Greeks: "How should
  we live?"[5]

  How should we live. I think in a different environment, he would
  have made a fantastic motivational speaker. I enjoy listening to
  him. What he says about the Ideal Observer and asks "What would
  it be like to take upon ourselves all the suffering of all the
  world for even a few seconds? It would be the ultimate
  nightmare"
  I love the clarity he speaks with. Ah! Paraphrasing:
  Views of humanity seem to have run the gamut from "We are of
  supreme importance to the Universe, to we are wretched creatures
  of the Universe. But there is a third view:

  That the significance of human beings to the Cosmos is
  Vanishingly Small".

  This implies, while our significance to the Cosmos is
  vanishingly small, *it's still significant* in some fashion - ie
  - NOT 0.

  and that's something to get excited about. Amazing as I've
  carried that viewpoint with me for a long time, and never heard
  it articulated so clearly.