One of the most insightful and challenging books I have ever read. I had to reread some sections and consult the glossary for some definitions, but it was well worth the effort. Schaeffer discusses the shift in the philosophy that has had the detrimental effect of creating a dichotomy between faith and reason. Most people in contemporary society now view the spiritual and the scientific as mutually exclusive whereas our predecessors looked to discover a philosophy that tied the two together. Schaeffer points out the inconsistencies that are inherent in philosophies and religions other than Christianity. The author asserts that historical Christianity is the only holistic philosophy that ties together faith in God with scientific discoveries and historical events as well as providing a reasonable explanation for the human condition. Schaeffer also encourages Christians to not get caught up in just trying to win a debate but to always present the truth with genuine love.