E.O. Wilson: Living in shimmering disequilibrium.

The naturalistic view, though, requires that we consider the broader meaning of the sacred: the deep sense of spirituality about each other and about our natural environment. And to sacralize, to make sacred, is in my view the end product of evolution in our moral and aesthetic reasoning. It proceeds from mere preference and liking, to custom, to ritualization, to law, all the way to ascribing that behavior or perception to a profoundly important source.