‍Catholics believe every Church rule is an unchangeable doctrine

  Gary Hoge  ·  November 6, 2026

‍This objection confuses two very different things: doctrines and disciplines. Catholics believe that the Church cannot change doctrines revealed by God. But that doesn’t mean every rule or practice established by the Church is unchangeable.

‍A doctrine is a teaching about faith or morals. For example, the Church teaches that Jesus Christ is truly God and truly man, that the Eucharist is his Body and Blood, and that baptism brings about the forgiveness of sins. These aren’t rules the Church invented. They’re truths the Church has received and is obligated to preserve.

‍A discipline, on the other hand, is a rule governing how the Church operates or how Catholics practice their faith. Disciplines can change, and throughout history they frequently have.

‍Consider a few examples:

• Priestly celibacy. In the Latin Church, priests are ordinarily required to remain unmarried. But this is a discipline, not an unchangeable doctrine. Many Eastern Catholic Churches have married priests, and the Latin Church sometimes ordains married men who were previously Protestant ministers.
• Fasting before Communion. Catholics today are ordinarily required to fast for one hour before receiving the Eucharist. In earlier centuries, the required fast was much longer. The Church changed the discipline without changing anything it teaches about the Eucharist.
• The language of the Mass. For centuries, the Mass in the Latin Church was ordinarily celebrated in Latin. Today it’s commonly celebrated in the language of the congregation. The language changed, but the essential nature of the Mass didn’t.
• Friday abstinence. Catholics were once generally required to abstain from meat on every Friday of the year. Today, in many countries, the rules permit other forms of penance on Fridays outside Lent.

‍None of these changes involved reversing a doctrine. They involved changing the rules by which Catholics live out their faith.

‍The Church doesn’t claim that every rule it establishes came directly from God. It claims the authority to govern the Christian community, and that necessarily includes the authority to establish, modify, and sometimes abolish disciplines.

‍We see the Church exercising governing authority in Scripture itself. In Acts 15, the apostles met in Jerusalem to settle a controversy about whether Gentile converts had to observe the Mosaic Law. They issued instructions for the Christian communities, demonstrating that the Church exercised authority over their practices from its earliest days.

‍Catholics don’t believe that everything the Church does must remain exactly as it was two thousand years ago. They believe that the truths God revealed must be preserved, while the Church’s disciplinary rules can be adapted to changing circumstances.