Ah, but it is good to be light-hearted, light as a feather, floating on air, on cloud nine, to have a light touch, make light work or to tread lightly, whereas it is bad to be ponderous, heavy-footed, weighed down, find things heavy going, throw your weight around, make heavy weather, or to carry the weight of the world on your shoulders.
There is a great deal of linguistic tension between whether "heavy" or "light" is good, one that exists in many different languages. See also the lengthy discussion on "heavy" versus "light" at the start of The Unbearable Lightness of Being.
I noticed that there has been some earlier discussion about Sam Harris’s Moral Landscape Challenge here at LW. As a writer on the Swedish politico-philosophical blog The Inverted Fable of Reality, I would like to share a response to the challenge, written by our main contributor, which I believe is interesting to read even if you are not familiar with The Moral Landscape or its content. See this link for the response and a short explanation of the challenge.
The response takes a different approach to most responses to the challenge. It is divided into four parts and starts by asking which ethic is most compatible with science and reality and finally tries to answer this question.