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 and salvation of Jehovah. Salvation is described as a free gift from God, but is said to be unattainable without good works that are prompted by faith. The works prove faith is genuine. Preaching is said to be one of the works necessary for salvation, both of themselves and those to whom they preach. They believe that baptism as a member of Jehovah's Witnesses is "a vital step toward gaining salvation", and that people can be "saved" by identifying God's organization. They also believe that conforming to the moral requirements set out in the Bible is essential for salvation. The Witnesses reject