When one first positions the Great Commission in the framework of the Missio Trinitas, then one can accurately discuss the missional, ontological argument for the church. When the church neglects the Missio Trinitas when considering the Great Commission, it can lead to a lack of doxological motivation for the Great Commission, illiteracy of the Triune God, and theological unfaithfulness. The author aims to argue a missional, ontological approach to the church by positioning it within the framework of the Missio Trinitas, then advance the doxological motivation of the church as the primary emphasis, as opposed to using soteriological, eschatological, kingdom, or wholistic motivations for missions. This repositioning will reveal the Triune God’s activity, which generated and birthed the church. Additionally, it will affect worship, trinitarian literacy, and the essence of the church. The paper discusses classical trinitarian theology and how it must apply to ecclesiology without jeopardizing orthodoxy. Also, it provides a robust ecclesiological perspective on the essence of the church, who the church worships, and how the church must be motivated when witnessing to the world.