"Philosophy of the Plan of Salvation: A Book for the Times" by James B. Walker is a theological exploration written in the late 19th century. This work delves into the nature of humanity's relationship with God, particularly focusing on worship, the influence of idolatry, and the necessity of a moral law. It examines the evolution of religious practices and beliefs, arguing for the divine origin of Christianity while addressing prevailing skepticism. The opening of this text introduces the author's personal journey from skepticism to firm belief in Christianity. It details the formative years when the author, alongside a friend, struggled to find convincing evidence of the divine origins of Christian faith. Motivated by their inquiries, the author began correspondence with his friend, sharing insights from an extensive examination of the Bible and historical contexts. Through this early correspondence, the foundation for the subsequent chapters is laid, which promise a deeper philosophical exploration and defense of the Christian faith as the ultimate revelation necessary for humanity's moral and spiritual salvation. (This is an automatically generated summary.)