Canon 750. §1 Those things are to be believed by divine and catholic faith which are contained in the word of God as it has been written down or handed down by tradition, that is, in the single deposit of faith entrusted to the Church, and which are at the same time proposed as divinely revealed either by the solemn magisterium of the Church, or by its ordinary and universal magisterium, which is manifested by the
common adherence of Christ’s faithful under the guidance of the sacred magisterium.
All are therefore bound to shun any contrary doctrines.

§2. The faithful are also required to accept and hold each and every one of the teachings that are definitively proposed by the Church’s magisterium regarding faith or morals, which are required to safeguard the deposit of the faith reverently and to expound it faithfully. Anyone who denies that these propositions are to be held definitively is therefore opposed to the Church’s teaching.
[revised wording according to m.p. Ad tuendam fidem, 18.V.1998]

§1. Fide divina et catholica ea omnia credenda sunt quae verbo Dei scripto vel tradito, uno scilicet fidei deposito Ecclesiae commisso, continentur, et insimul ut divinitus revelata proponuntur, sive ab Ecclesiae magisterio sollemni, sive ab eius magisterio ordinario et universali; quod quidem communi adhaesione christifidelium sub ductu sacri magisterii manifestatur; tenentur igitur omnesquascumque devitare doctrinas iisdem contrarias.

§2. Firmiter etiam amplectenda ac retinenda sunt omnia et singula quae circa doctrinam de fide vel moribus ab Ecclesiae magisterio definitive proponuntur, scilicet quae ad idem fidei depositum sancte custodiendum et fideliter exponendum requiruntur; ideoque doctrinae Ecclesiae catholicae adversatur qui easdem propositiones definitive tenendas recusat.