Catholic Church - Doctrine

Doctrine

The fundamental beliefs of the Christian religion are summarised in the Nicene Creed. For Catholics, they are detailed in the Catechism of the Catholic Church. Based on the promises of Christ in the Gospels, the Church believes that it is continually guided by the Holy Spirit and so protected infallibly from falling into doctrinal error. The Catholic Church teaches that the Holy Spirit reveals God's truth through Sacred Scripture, Sacred Tradition and the Magisterium.

Sacred Scripture consists of the 73 book Catholic Bible. This is made up of the 46 books found in the ancient Greek version of the Old Testament—known as the Septuagint—and the 27 New Testament writings first found in the Codex Vaticanus Graecus 1209 and listed in Athanasius' Thirty-Ninth Festal Letter. Sacred Tradition consists of those teachings believed by the Church to have been handed down since the time of the Apostles. Sacred Scripture and Sacred Tradition are collectively known as the "deposit of faith" (depositum fidei). These are in turn interpreted by the Magisterium (from magister, Latin for "teacher"), the Church's teaching authority, which is exercised by the Pope and the College of Bishops in union with the Pope, the bishop of Rome.