St. Thomas Aquinas contributed a great deal to the entirety of Christian Theology both during and after his life; particularly in his writings. St. Thomas, as he is referred to in short, was an astute Biblical scholar who was as devoted to the faith in human reason as he was in God. St. Thomas’ tome, Summa Theological, is, literally, the summation of his understanding of theology. In this work Aquinas single-handedly justified and ‘proved’ the whole of the spiritual nature, the soul, God, and a Christian life. It is the purpose of this paper to discuss the contributions of St. Thomas Aquinas to Christian theology and his impact upon Christianity itself.