History of Jehovah's Witnesses book, "Three Worlds and the Harvest of This World", was published in early 1877. It articulated ideas that remained the teachings of Russell's associates for the next 40 years, many of which are still embraced by Jehovah's Witnesses: it identified a 2520-year-long era called "the Gentile Times", which would end in 1914, and broke from Adventist teachings by advancing Russell's concept of "restitution" — that all humankind since Adam would be resurrected to the earth and given the opportunity for eternal perfect human life. Russell claimed it was the first book to combine biblical end-time prophecies with the concept of
Jehovah's Witnesses beliefs sovereignty on people, choosing to save only those who want to serve him, even though the course of mankind in general may lead them to harm. Witnesses teach that God must be distinguished by his personal name—"Jehovah". The name is a common modern Latinized form of the Hebrew Tetragrammaton, or four-letter name, transliterated as "YHWH". The use of his personal name is regarded as vital for true worship, and Witnesses usually preface the term "God" with the name "Jehovah". The title, "" (Greek: "Kyrios"), is rarely used by Witnesses when speaking about God. Because no other religion uses the name