We believe in the Bible because it is trustworthy, clear, and sufficient. But there is another reason—the Bible is practically efficacious. This has been tested and confirmed over the centuries. At the same time, when speaking of the efficacy of Scripture, many people do not fully understand exactly how it works. What is needed for Scripture to be effectual? And what result does it guarantee? The answers to all these questions are clearly set forth in the Bible. Scripture speaks for itself, helping us to understand, accept, and apply its truth, which produces a supernatural effect in the lives of those who trust in it.