First Vatican Council

The council met amid rationalism, fideism, materialism, political revolutions, and attacks on the Church’s freedom. Hundreds of bishops from around the world participated. Discussion of papal infallibility became especially intense as armies approached Rome.

Dei Filius: Faith and Reason

The council taught that God can be known with certainty from created things by natural reason, while supernatural revelation communicates truths and mysteries that exceed reason. Faith and reason cannot truly contradict because God is the author of both.

Pastor Aeternus: Primacy

The Roman Pontiff possesses a primacy of jurisdiction over the whole Church, ordered to preserving unity in faith and communion.

Papal Infallibility

The pope is preserved from error when, speaking ex cathedra as shepherd and teacher of all Christians, he definitively defines a doctrine of faith or morals to be held by the whole Church. This charism does not make every papal statement infallible.

The council was formally suspended, not doctrinally repudiated. Vatican II later completed important aspects of ecclesiology by teaching more fully on the episcopal college, the People of God, and the Church’s sacramental nature while explicitly continuing Vatican I.

An ecumenical council’s authority must be read according to the subject and form of each act. Dogmatic definitions, authoritative doctrinal judgments, moral principles, disciplinary canons, juridical penalties, and prudential political decisions do not all possess the same permanence or theological weight.

Vatican I helps Catholics avoid both rationalism and anti-intellectual fideism. It also explains the papal office as a service to the Church’s unity, not personal absolutism detached from Revelation, Tradition, bishops, and the whole faith.