First published in 1912, this book by F. R. Tennant was intended to redress the vague and inconsistent conceptions of sin that were popularly held at the beginning of the twentieth century. Tennant maintained that for any ongoing debate to remain meaningful, it was imperative that definitions of key terms should keep pace with discussion. Therefore his study aimed at providing a clear, logical definition of what sin in Christian doctrine represented, whilst also bringing to bear the importance of ethics and psychology to any modern understanding of the subject.