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 confidence" in the leadership, avoid skepticism about what is taught in the Watch Tower Society's literature, and "not advocate or insist on personal opinions or harbor private ideas when it comes to Bible understanding." The organization makes no provision for members to criticize or contribute to official teachings and all Witnesses must abide by its doctrines and organizational requirements. Jehovah's Witnesses emphasize the use of God's name, and they prefer the form "Jehovah"—a vocalization of God's name based on the Tetragrammaton. They believe that Jehovah is the only true God, the creator of all things, and the "Universal Sovereign". They