What Does 'Primacy of Conscience' Really Mean?

A Phrase With Two Meanings

“Primacy of conscience” is one of the most frequently invoked phrases in modern Catholic debate. In one sense, it is Catholic teaching. The Church holds that a person must always follow the certain judgement of their conscience (CCC 1790).

In another sense, the phrase is often used to mean something quite different: that a Catholic’s personal view can override the Church’s moral teaching, so that one may disagree in good conscience with any teaching one finds unpersuasive.

To understand the difference, we need to look more closely at what conscience is. (The basic teaching is in What Is Conscience, and Must I Always Follow It?)

Two Levels of Conscience

St Thomas Aquinas, drawing on earlier tradition, distinguished two levels in the moral life of the mind (Summa Theologiae I, q. 79, aa. 12–13).

Synderesis is the deep, natural grasp of the first principles of morality: that good is to be done and evil avoided, and the basic goods of human life. It is a permanent disposition of the mind, and Aquinas held that at this level the mind does not err. It is what makes every human being a moral being.

Conscience, in the strict sense, is an act: the judgement by which we apply those principles to a concrete situation. “Here and now, this would be wrong.” Because it involves reasoning, it can go astray, just as any reasoning can.

This distinction is crucial. When the Church says that conscience is a sacred voice in which God speaks, she is pointing above all to the deep level: the inner awareness of the moral law. When she says conscience can err and must be formed, she is speaking of the level of particular judgements.

Must We Follow a Mistaken Conscience?

Aquinas asked whether a person must follow a conscience that is in error. His answer is the basis of the Church’s teaching.

Yes, we must follow our conscience, even when it is mistaken. To act against what we sincerely believe to be right is always wrong, because we would be choosing what we think is evil (Summa Theologiae I–II, q. 19, a. 5).

But following a mistaken conscience does not always excuse us (I–II, q. 19, a. 6). If the error is our own fault, because we neglected to learn the truth or let our judgement be dulled by sin, then we remain responsible for the wrong we do. The Catechism repeats this exactly (CCC 1791).

So conscience has a real primacy: we must always act on it. But that primacy comes with a duty that is equally serious: to make sure our conscience is true.

Newman’s Toast

The phrase most often quoted in this debate comes from St John Henry Newman. In his Letter to the Duke of Norfolk (1875), defending Catholics against the charge that they were mere slaves of the Pope, he wrote that if he had to bring religion into an after-dinner toast, he would drink “to the Pope, if you please, still, to Conscience first, and to the Pope afterwards.”

This line is often used to suggest that Newman placed personal opinion above Church authority. Read in context, it means almost the opposite.

In the same letter, Newman describes conscience as “the aboriginal Vicar of Christ” in the soul: a messenger from God, not a matter of personal taste. He contrasts it sharply with the modern counterfeit, which he called “the right of self-will.” Newman thought that conscience and the Church’s teaching come from the same source, God, and so cannot finally conflict. The Pope’s authority itself rests on conscience: Catholics obey him because conscience tells them that Christ’s Church speaks with His authority.

Newman’s toast was a defence of conscience as God’s voice, not a licence for dissent.

Ratzinger: Conscience and Truth

Cardinal Joseph Ratzinger, later Pope Benedict XVI, explored this question in a well-known lecture, “Conscience and Truth” (1991).

He criticised the idea that conscience is simply subjective certainty, the feeling of being sure. If that were all conscience is, he argued, then those who carried out terrible crimes with untroubled consciences would be justified. Some of the worst wrongdoers in history were completely convinced they were right.

Ratzinger pointed to a line from the Psalms: “Who can discern his errors? Clear me from hidden faults” (Psalm 19:12). The real guilt, he suggested, often lies deeper than the wrong act. It lies in the loss of the capacity to see that it is wrong, through years of ignoring the inner voice. A conscience that never troubles us is not a sign of virtue. It may be a sign that something has been silenced.

He used the ancient Greek idea of anamnesis, or remembrance, to describe the deep level of conscience: an original memory of the good, built into us by the Creator. The Church’s teaching does not impose something alien on conscience. It helps conscience remember what it already, at its depth, knows.

Veritatis Splendor: Not “Creative”

St John Paul II addressed the question directly in his encyclical Veritatis Splendor (1993). He rejected the view that conscience makes “creative” decisions: that it can decide, in particular cases, that something the moral law forbids is nevertheless right for me (Veritatis Splendor 54–56).

Conscience, he taught, does not create moral truth. It is a witness to it. Its dignity comes precisely from its relationship to truth. Freedom of conscience is never freedom from the truth, but freedom in the truth (Veritatis Splendor 64).

For a Catholic, this means that the Church’s moral teaching is not one opinion among others to be weighed against my own. It is one of the principal ways God helps me form my conscience correctly. “In the formation of their consciences the Christian faithful must give careful attention to the sacred and certain teaching of the Church” (Dignitatis Humanae 14).

What Primacy Really Means

Put together, the Catholic teaching is clear.

Conscience is supreme in action. No one may be forced to act against their conscience, especially in religious matters (CCC 1782). And no one may act against their own certain conscience.

Conscience is not autonomous. It does not invent right and wrong. It discovers a law it did not make and must obey.

Conscience must be formed. We have a grave duty to form our conscience well, using reason, Scripture, the Church’s teaching, prayer and good counsel.

Disagreement is a call to study, not a verdict. A Catholic who finds a moral teaching hard should not simply conclude that conscience overrides it. The right response is to study the teaching, pray, seek guidance, and ask honestly whether one’s own judgement might be clouded.

The primacy of conscience is real. But it is the primacy of a servant of truth, not of a sovereign.