This book uses the scientific method to combine enlightened self interest with the teachings of Jesus to propose a theory of how mankind acts and should act. With Darwin's theory of evolution, we know that human beings must be able to adapt to their environment to survive as a species. The Individual must be able to sense what is good for himself. This positive chemical reaction to the environment is called security. This book proposes three theories of security. The first is that the individual seeks what he perceives to be his own individual security. The second is that the individual should try to maximise his security over time.