Systematic Theology by Robert Letham In the arena of systematic theology, Dr. Robert Letham is a seasoned traveler and a practitioner who combines vast historical knowledge with a careful sense of how the Bible speaks to all matters of theology. His new Systematic Theology is a lifetime of work that comes in at a whopping 1,074 pages. Rather then being a dry tome of old rehashed terrain, Dr. Letham posits each section around something central to the Doctrine of God, giving us clarity on who the focus is of our inquiry. One of the great reliefs to find in the book was Letham’s insistence that we begin with the Trinity. Although the Trinity is not explicit in the Old Testament, it still is there in its latent form. However, in many instances there is an overwhelming view towards the Trinity in the first testament. Letham writes, “The Spirit of God is mentioned nearly four hundred times in the Old Testament. Generally, the Spirit is seen as the power of God at work, but m