 One of the common tenets of ancient philosophy which was abandoned in the period beginning with Descartes is that a person “could not have access to the truth” without undertaking a process of self-purification that would render him “susceptible to knowing the truth” (Foucault 1997, 278–279). For Thoreau, it was the work of a lifetime to cultivate one’s receptivity to the beauty of the universe. Believing that “the perception of beauty is a moral test” (Journal, 6/21/52), Thoreau frequently chastises himself or humanity in general for failing in this respect. “How much of beauty—of color, as well as form—on which our eyes daily rest goes unperceived by us,” he laments (Journal, 8/1/60); and he worries that “Nature has no human inhabitant who appreciates her” (Walden, IX). Noticing that his sensory awareness has grown less acute since the time of his youth, he speculates that “the child plucks its first flower with an insight into its beauty and significance which the subsequent botanist never retains” (Journal, 7/16/51 &amp; 2/5/52). In order to attain a clear and truthful view of things, we must refine all the faculties of our embodied consciousness, and become emotionally attuned to all the concrete features of the place in which we are located. We fully know only those facts that are “warm, moist, incarnated,” and palpably felt: “A man has not seen a thing who has not felt it” (Journal, 2/23/60). In this way, Thoreau outlines an epistemological task that will occupy him for the rest of his life; namely, to cultivate a way of attending to things that will allow them to be experienced as elements of a meaningful world.