The Trinity, one of the foundational and essential doctrines of Christianity, yet the word is not even found in the Bible (Grudem, 2004). There are thousands of books, articles, lectures, and sermons on the topic of the Trinity. However, one of the most helpful studies one can endeavor is the historical development of the Trinity. Studying the historical development of an essential doctrine of the church will help Christians become more familiar with Biblical doctrine. Also, it will encourage and equip them to defend their faith; it will shape them more into the image of Christ, and help them become better ministers of the Gospel (“Grand Canyon University,” 2019).