In summary, the infallibility of the Catholic Church means that Christ has given her a special charism (gift) of the Holy Spirit so that she cannot err when she definitively teaches on matters of faith (what we must believe) or morals (how we must live according to God’s law).
This protection prevents the Church from teaching error as official doctrine in these areas.It applies specifically when:
- The Pope speaks ex cathedra (from the chair of Peter, solemnly defining a doctrine for the whole Church), or
- The bishops, in union with the Pope (especially in an ecumenical council or through the ordinary and universal Magisterium), teach a doctrine definitively.
This infallibility is limited: it does not mean the Church or her leaders are impeccable (sinless), nor does it cover personal opinions, disciplinary rules, scientific matters, or non-definitive teachings. It only safeguards the deposit of divine Revelation and truths necessarily connected to it.
The purpose is to ensure the Church faithfully hands on the truth of Christ without corruption, so the faithful can trust her definitive guidance on salvation.
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