This article explores the vows of initiation rituals of the Way of Pervading Unity (Yiguan Dao 一貫道) in postwar Taiwan and briefly traces their relationship back to the vows of liturgies of the Way of Former Heaven (Xiantian Dao 先天道). First, the article provides a concise explanation of Xiantian Dao initiation rites and the vows performed within them. Thereafter, it explores the vows of Yiguan Dao's initiation ritual, the "Pointing the Way" (diandao 點道) ceremony, and analyzes the implications of these vow texts and their variations. Then, the article considers the varied interpretations of initiation rites vows by government officials, journalists, Buddhists, Christians, and Yiguan Dao adherents, paying special attention to outside criticisms and internal reactions. Finally, the article compares Xiantian Dao and Yiguan Dao initiation vows and offers a preliminary investigation of shared heritage between them and future developmental trends.