Dr. Clark's, Building a Path is the necessary roadmap to the current, cultural epistemology. For those with a Christian worldview it is axiomatic that "truth is not relative", but there's a difference between modern relativism and postmodern skepticism, and knowing the distinction is critical to addressing sincere doubts about truth. Dr. Clark helpfully distinguishes truth, knowledge, justification, power, and authority, and locates the sources of skepticism, as well as the source of truth and knowledge.