The contributions of the philosopher-theologian, Dallas Willard, are continuing to impact the spiritual development of many Christians. While his lectures and books garner attention, Willard is not properly understood when his philosophy is neglected. Christian scholarship is lacking research on how Willard’s philosophy and theology are integrated and provide ministerial application. Those who are unfamiliar with Willard’s philosophy background risk misunderstanding his biblical convictions. Gary Black Jr. and Michael Robb, leading scholars of Willard, understand this. For example, Willard’s philosophy is strongly evident in his ecclesiology. To understand his ecclesiology, one must first study his ontology and alignment with the philosophical schools of epistemic and metaphysical realism. This is the origin of his phrase “progressive apprehension,” describing the gradual understanding God’s people had about Jesus and the kingdom of God throughout salvation history. Then, attention must be given to Willard’s perspective on the kingdom of God and the book of Acts. Willard contributes to an ongoing conversation on the kingdom of God and the theological significance of Acts including perspectives from New Testament scholars John Bright, George Eldon Ladd, and N.T. Wright. When Willard’s philosophy is integrated with his theology, readers will realize that his ecclesiology offers much more than initially appears. This leads one to seriously evaluate and consider Willard’s ecclesial suggestions for church ministry in the 21st Century. This paper will argue that Dallas Willard’s ontology of the kingdom of God is foundational his ecclesiology.