What Christians Should Know About...Their Value to God. Although Christians may have some knowledge of basic doctrine,they do not always know how to apply biblical truths to their lives. As a consequence the remain affected by problems from which they can be free. This series aims to bring understanding and knowledge into areas of ministry which frequently affect believers. These books are, by definition, an introduction to subjects dealt with, but aim to bring the main principles of biblical truth in a practical and easy to follow format.