De fide
Encyclopedia
De fide is a "theological note" or "theological qualification" that indicates that some religious doctrine is an essential part of Catholic faith and that denial of it is heresy
Heresy
Heresy is a controversial or novel change to a system of beliefs, especially a religion, that conflicts with established dogma. It is distinct from apostasy, which is the formal denunciation of one's religion, principles or cause, and blasphemy, which is irreverence toward religion...

.

The doctrine is de fide divina et ecclesiastica (of divine and ecclesiastical faith), if contained in the sources of revelation and therefore believed to have been revealed by God (de fide divina) and if taught by the Church (de fide ecclesiastica). If a doctrine has been solemnly defined by a pope
Pope
The Pope is the Bishop of Rome, a position that makes him the leader of the worldwide Catholic Church . In the Catholic Church, the Pope is regarded as the successor of Saint Peter, the Apostle...

 or an ecumenical council
Ecumenical council
An ecumenical council is a conference of ecclesiastical dignitaries and theological experts convened to discuss and settle matters of Church doctrine and practice....

 as a dogma
Dogma
Dogma is the established belief or doctrine held by a religion, or a particular group or organization. It is authoritative and not to be disputed, doubted, or diverged from, by the practitioners or believers...

, the doctrine is de fide definita.

What is believed to be a truth contained in the sources of revelation thus becomes a "dogma", in the present ecclesiastical sense of this word, only when enunciated by the Church: "According to a long-standing usage a dogma is now understood to be a truth appertaining to faith or morals, revealed by God, transmitted from the Apostles in the Scriptures or by tradition, and proposed by the Church for the acceptance of the faithful."

Sources

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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