The Syllabus of Errors (Latin: Syllabus Errorum) was a document issued by Pope Pius IX in 1864 as an appendix to his encyclical Quanta Cura. It condemned as heresy 80 propositions, many on political topics, distributed over a set of ten subheadings:
- pantheism, naturalism, and absolute rationalism;
- moderate rationalism;
- indifferentism and latitudinarianism;
- socialism, communism, secret societies, Bible societies, and liberal clericalal societies;
- the church and its rights;
- civil society and its relationship to the church;
- natural and Christian ethics;
- Christian marriage;
- the temporal power of the Pope; and
- modern liberalism.
Many of the statements in the Syllabus had been picked from previous Papal documents; collected in one place, they created a more complete picture of the social teaching of the Roman Catholic Church. The document met with a mixed reception among Roman Catholics; generally only the most conservative of them were able to endorse the document unreservedly. The government of France briefly tried to suppress the circulation of the encyclical and the Syllabus within its borders. Within the Protestant world reactions were uniformly negative.
Some of the political or dogmatic propositions of the Syllabus may be abrogated by later documents coming from the Second Vatican Council in 1962; before the Council, the Syllabus represented the Roman Catholic Church's teachings on social and political subjects.
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