This article provides an analysis of how the philosophy of Aristotle and St. Thomas Aquinas, particularly their treatment of the "Problem of the One and the Many," can help inform Sam Harris's attempt to ground ethics in the empirical sciences in his 2010 book The Moral Landscape: How Science Can Determine Human Values. -/- The paper shows how Aristotle and Aquinas's thought can: • Explaining how the sciences are organized and why they will not produce multiple, competing measures of goodness (...) and well-being; • Resolving the “moral paradoxes” that Harris finds himself unable to find a solution to, by demonstrating how the human good essentially involves a “common good,” and how goodness always relates to the whole; • Providing us with a better explanation for why selfless behavior is good and why it is “good for us” to be virtuous; • Providing Harris with a better definition of freedom as self-determination; and • Showing how neither a recognition that the sciences must play a major role in ethics, nor naturalistic explanations of human behavior, need to preclude our orientation towards a transcendent good. (shrink)