If you take all the marketing books in the world and distill them, the key to marketing is hope. People buy hope, the hope that you will help them solve a problem or achieve a goal.
However, the Bible is called the Word of God because the whole transcript is an inspired, faithful, and infallible record of what God determined essential for us to know about Himself, the cosmos in which we live, our spiritual allies and adversaries, and our fellow man.