Scripture teaches us that there are two distinct types of sin that Christians can commit. They can commit sin not to death, and they can commit sin to death. Although all sin without exception, eventually leads to spiritual death, there is a sin that believers can commit, that will kill their spirits. Scripture differentiates this sin from every other sin, by telling us that all other sins do not kill the born-again human spirit. This book looks at the difference between the two types of sin, and specifically what is the sin to death, and how believers can be led to commit this sin.