This book is a primer on the Bible. In this book about the truthfulness of the Bible, John MacArthur, Jr. writes to strengthen believers. His main purpose in writing is to undergird the believer's confidence in the Bible as God's authoritative Word, so that each personally can know why he believes the Bible. MacArthur's approach is to start with the fact that the Bible is the Word of God; therefore, its statements are correct, the miracles of which it speaks have taken place, and lives are continuously changed by the truth it reveals.