The security of the Christian is complete and entire, wanting nothing. There are, however, some pervasive—and dangerous—notions as the nature of Christian security. A false security, reasons the author, is worse than none at all, for it can breed carelessness and unfounded confidence. In this classic study, W. T. Purkiser presents a well articulated discussion of the great biblical promises that will safeguard our souls and keep us from presumptuous sin. Purkiser's purpose is that we comprehend—and experience—the true security promised to all of Gods children. Paper.
"Security: The False and the True" seems to be written as an answer to another book which I've not read. However, it covers a theme which is very actual even today. Book is written in 1956 with a second edition in 1974, but I'm grateful that I could read more about security of salvation in Christ. The author doesn't mention the wide spread phrase "Once saved, always saved", but the book just answers how true is that idea. Salvation as explained in the New Testament includes believing, following Christ, endurance, keeping the faith, walking in the Spirit, all of which are in present tense.
I took one star, because the author includes so many verses that the book is almost quoting from the Bible with a very little explanation (not that the Bible can't explain the subject by itself). Book doesn't include a chapter how someone could become a Christian, but starts directly with security of salvation, obviously answering another book.
If someone wants a deeper explanation on the subject, I would recommend also the books of David Pawson.