We are required to know and to believe:

• That there is one supreme, eternal, infinite God, the Creator of Heaven and earth.
• That the good will be rewarded by him for ever in Heaven, and that the wicked who die unrepentant will be punished for ever in Hell.
• That in the Holy Trinity there are three Persons, coeternal, coequal: God the Father, God the Son, and God the Holy Spirit.
• That the Second Person of the Holy Trinity became man and died on the Cross to save us.
• The tenets of the Apostles Creed.
• In the Commandments of God and of the Church.
• That the Seven Sacraments were instituted by Christ to give us grace; especially, that Baptism is necessary and that the Eucharist is a pledge of our future Glory.
• That Sacred Tradition and Sacred Scripture, which together form one sacred deposit of the Word of God, are entrusted to the Church.
• Whatever God teaches us by his Church, who in her teaching cannot deceive us or be deceived.

‘The Roman Pontiff, head of the college of bishops, enjoys [this] infallibility in virtue of his office, when, as supreme pastor and teach of all the faithful, he proclaims by a definitive act of doctrine pertaining to faith or morals…. The infallibility promised to the Church is also present in the body of bishops when, together with Peter’s successor, they exercise the supreme ‘Magisterium,’ above all in an Ecumenical Council.  When the Church through its supreme Magisterium proposes a doctrine ‘for belief as being devinely revealed’ and as the teaching of Christ, the definitions ‘must be adhered to with the obedience of faith.'” ^{CCC 891}