The teaching that God is one was paramount in Old Testament theology, since the introduction of the New Testament the concept of one God continued and was expanded by and through Jesus in Second Temple Monotheism. With this in mind, the Bible does not teach the concept of the Trinitarian doctrine. The Apostles, including the New Testament Church, were pure monotheistic and oneness believers knowing and understanding that God is one and not one substance and three persons. Therefore, this book has addressed a variety of issues and provided a body of literature and authority supporting the position that God is numerically one and that the Trinitarian doctrine is a human construct and product that is unscriptural and unbiblical, which evolved over the centuries being fueled by man made creeds and ideologies. It is not surprising then that even Trinitarians struggle to define the Trinitarian doctrine suggesting it is a mystical revelation, when in fact, others have argued that it is incomprehensible.