 The Roman Catholic and Eastern Orthodox Churches had developed from early on the idea of infallibility of the Church — that the Church may speak entirely without error in particular councils or edicts; or that, in a less definable way, the Church is infallibly directed so that it always stands in the truth; and indeed, and claim that the Church has the promise of Jesus that it shall do so.The Roman Catholic Church also developed on the parallel and complementary idea of papal infallibility — that the pope may speak in the same capacity; this idea was finally defined dogmatically at the First Vatican Council of 1870 and incorporated into doctrine.In contrast, Protestants believe that the Church has only spoken infallibly through the Scriptures since the time of the Apostles, and should not expect to be completely free of error at any time until the end of the world, and rather must remain continually vigilant to maintain a Biblical (and therefore authoritative) doctrine and faith, or else fall away from the Christian faith and become an enemy of the truth.