Studies in the Scriptures is a series of publications, intended as a Bible study aid, containing seven volumes of great importance to the history of the Bible Student movement, and the early history of Jehovah's Witnesses.
The author of Studies in the Scriptures, Charles Taze Russell, reported that he did not write them "through visions and dreams, nor by God's audible voice," but that he sought "to bring together these long scattered fragments of truth". The first volume was written in 1886. Originally titled The Plan of the Ages as part of a series called Millennial Dawn, it was later renamed The Divine Plan of the Ages. The name of the series was changed to Studies in the Scriptures in 1904 in order to clarify their nature as biblical textbooks.
The series was written as a Bible study aid. The intention was that by studying the Bible topically, rather than verse by verse, details of God's purpose might become clearer. The series progresses from elementary topics, such as the existence of God and promoting the Bible as God's word, to deeper subject matter throughout the series.
The series was criticized by some early 20th century ministers as an attempt to replace the Bible. Russell's view was that whilst the Bible had been studied by different methods, topical study was the best approach. In addition to other material, the six volumes contain commentary about biblical events and expressions. Russell did not claim infallibility, but declared that God's plan of salvation could not be understood independently from his writings. He stated, "if he then lays [the Studies in the Scriptures] aside and ignores them and goes to the Bible alone, though he has understood his Bible for ten years, our experience shows that within two years he goes into darkness."Studies in the Scriptures claimed to represent that humankind had reached the end of the current era, and that Jesus would soon separate the wheat from the weeds.
Following Russell's death in 1916, a seventh volume—entitled The Finished Mystery—was published in 1917 and advertised as his "posthumous work". This seventh volume was a detailed interpretation of the book of Book of Revelation, but also included interpretations of Ezekiel and the Song of Solomon. An advertisement for the book in Zion's Watch Tower called it "the true interpretation", and it was promoted as being "of the Lord—prepared under his guidance."