Book excerpt: We don't often think about the act of knowing, but if we do, the question of what we know and how we know it becomes murky indeed. Longing to Know is a book about knowing: knowing how we know things, knowing how we know people, and knowing how we know God. This book is for those who are considering Christianity for the first time, as well as Christians who are struggling with issues related to truth, certainty, and doubt. As such, it is a wonderful resource for evangelists, pastors, and counselors. This unique look at the questions of knowing is both entertaining and approachable. Questions for reflection make it ideal for students of philosophy and all those wrestling with the questions of knowledge.