"A Comprehensible Universe" is a scholarly book that addresses the question of why our world is understandable. The authors, who possess expertise in physics, astronomy, and theology, explore the deep roots of rationality and its development over more than two and a half millennia. They illuminate the emergence of scientific thinking, which is based on the Greek concept of rationality, and analyze the limitations of the scientific method in the context of modern theories such as relativity and quantum mechanics. The book offers a balanced discussion on the relationship between science and theology, emphasizing the importance of empirical evidence and rational thought. It is aimed at readers interested in the philosophical and theological aspects of science and those who wish to understand the complexity of rationality in the modern world.