Four times safe

The author says in the introduction: "In 1929 we wrote a book titled A Threefold Salvation, based on the instruction we had received during our spiritual childhood. Like most of that early teaching, this was flawed because it was inadequate. As we continued our study of the Word of God, more light has been granted to us on this subject - yet how ignorant we still are - and this has made us see that, in the past, we had started at the wrong point, because instead of starting at the beginning, we started almost in the middle. Instead of salvation from sin being threefold, as we then supposed, we now perceive that it is fourfold. How good the Lord is in granting us more light, and yet, it is now our duty to walk in it, and, as Providence provides us the opportunity, to give it to others. May the Holy Spirit in His grace so direct us that God may be glorified and His people edified."