The eye which can appreciate the naked and absolute beauty of a scientific truth is far more rare than that which is attracted by a moral one.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“Behind every man’s busy-ness there should be a level of undisturbed serenity and industry, as within the reef encircling a coral isle there is always an expanse of still water, where the depositions are going on which will finally raise it above the surface. The eye which can appreciate the naked and absolute beauty of a scientific truth is far more rare than that which is attracted by a moral one. Few detect the morality in the former, or the science in the latter. Aristotle defined art to be Λόγος τοῦ ἔργου ἄνευ ὕλης, The principle of the work without the wood; but most men prefer to have some of the wood along with the principle;” source