In the wake of a profound shift in Western beliefs and attitudes, the notion of moral knowledge has vanished from the public sphere. This seismic transformation, which unfolded over the course of the 20th century, has left individuals bereft of guidance on how to live a morally upright life. The institutions once entrusted with imparting moral wisdom have fallen silent, leaving a void that has yet to be filled. Through a meticulous examination of the major developments in ethical theory from the late 19th to the late 20th centuries, Dallas Willard's unfinished manuscript, now brought to fruition by his former students, reveals the pivotal role philosophy played in this metamorphosis. By highlighting the shortcomings of these developments, Willard demonstrates that the disappearance of moral knowledge was not the result of rational discourse or discovery, but rather the consequence of arational social forces. This groundbreaking work offers a unique perspective on the history of ethics and social morality, engaging with a diverse range of thinkers, including T.H. Green, G.E. Moore, Charles L. Stevenson, John Rawls, and Alasdair MacIntyre. Ultimately, it proposes a novel solution for reclaiming moral knowledge, inspired by the phenomenological approaches of Knud Logstrup and Emmanuel Levinas. The culmination of Willard's lifelong quest to establish a secure basis for the moral life, this book is a testament to his enduring legacy.