Infallibility and Heresy

The question of what proposition of the Church are infallibly true and of the Deposit of Faith is quite important.  Heresy is opposed to these propositions, which come from two sources, the Ordinary Magisterium and the Extraordinary Magisterium.

Sources of the Ordinary Magisterium


Sources of the Extraordinary Magisterium

Councils of the Church

Decrees of the Roman Pontiffs

 A good resources is Henry Denzenger’s Enchiridion Symbolorum.  The thirtieth edition is in translation as The Sources of Catholic Dogma.  Denzinger’s online.  It should be kept in mind, that some things are not of Divine and Catholic Faith, to which the opposite is heresy.  See the page on Theological Labels for more information.