Philosopher · Modern
Félicité de Lamennais
1782–1854 · Liberal Catholicism; traditionalism (common consent)
His liberal Catholicism was condemned in Mirari Vos (1832) and his “Paroles d'un croyant” in Singulari Nos (1834); he left the Church and died unreconciled.
A Breton priest who began as the most extreme ultramontane, grounding certitude in the “common consent” of mankind rather than individual reason, and ended as the father of liberal Catholicism, demanding separation of Church and state, freedom of the press and alliance with the peoples against the thrones. After Gregory XVI's rebuke he broke with the Church entirely.
Why he matters: The man who set the agenda for a century of debate about Catholicism and liberty: Montalembert, Lacordaire and Ozanam were his disciples, and the Church's later engagement with democracy was worked out partly in reaction to him.
Where to be careful
Condemned in Mirari Vos (1832) and Singulari Nos (1834) for indifferentism, unrestricted liberty of conscience and the press, and separation of Church and state; his philosophical traditionalism (certitude by common consent) was also rejected by the Church in 1855. Read as history, not as a guide.
Reading
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Essay on Indifference in Matters of ReligionFélicité de Lamennais · The early ultramontane and traditionalist work.
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Words of a Believer (Paroles d'un croyant)Félicité de Lamennais · The prophetic tract condemned in Singulari Nos; read with the encyclical.
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Mirari VosPope Gregory XVI, 1832 · The Church's answer to L'Avenir.
Documented positions
Where this thinker stands on each dispute the test covers.