Thanks, HotChic for a very interesting and inspiring thread. I kind of think answering this question is maybe like asking a fish to define and explain water. I have some thoughts on it but I can't do better than so many have already done. But aside from agreeing with much of what I just read in this thread I want with all my soul to be able to praise, bless, and thank those who are pulled by the love of good. I don't know how to do that of course, and I don't have the words but I love and admire those who seek to live that way. I heard somebody mock the moral with the quip, Virtue is its only reward. Well if you're only going to get one reward there's nothing like one that's titanic.
I read about some recent research with monkeys working to get a reward. The researcher essentially gave a big reward to some monkeys who did little to earn it and little for those who had to do more. Them monkeys quit playing the game. They instinctively understood fair play. I think humans are born wanting to please and wanting to love and be loved.
Given that as a factual datum, the question I ask is why. We have the universe and the evolution of conscious man. What is is a reflection of what is. Life is driven by the forces that drive evolution and what evolved is love. So for life the essential property of the universe is Love, the water of our fish. May you be one with your mirror.