The entire Protestant canon of scripture is considered the inspired, inerrant word of God. Jehovah's Witnesses consider the Bible to be scientifically and historically accurate and reliable and interpret much of it literally, but accept parts of it as symbolic. They consider the Bible to be the final authority for all their beliefs, although sociologist Andrew Holden's ethnographic study of the religion concluded that pronouncements of the Governing Body, through Watch Tower Society publications, carry almost as much weight as the Bible. Regular personal Bible reading is frequently recommended; Witnesses are discouraged from formulating doctrines and "private ideas" reached through Bible research independent of Watch Tower Society publications, and are cautioned against reading other religious literature. Adherents are told to have "complete 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 religion makes no provision for members to criticize or contribute to official teachings and all Witnesses must abide by its doctrines and organizational requirements.