Armstrongism is the teachings and doctrines of Herbert W. Armstrong while leader of the Worldwide Church of God (WCG). His teachings are professed by him and his followers to be the restored true Gospel of the Bible. Armstrong said they were revealed to him by God during his study of the Bible. The term Armstrongite is sometimes used to refer to those that follow Armstrong's teachings. Armstrongism and Armstrongite are generally considered derogatory by those to whom it is applied, who prefer to be known as members of the Church of God (COG). These doctrines were also espoused by his sons Richard David Armstrong (until his death in 1958) and Garner Ted Armstrong (until his death in 2003) with slight variations.