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Rerum novarum

1891 encyclical issued by Pope Leo XIII

  • 18 min read
  • 9 chapters

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A foundational text of modern Catholic social teaching, many of the positions in Rerum novarum are supplemented by later encyclicals, in particular Pius XI's Quadragesimo anno (1931), John XXIII's Mater et magistra (1961), Paul VI's Octogesima adveniens (1971), John Paul II's Centesimus annus (1991), and Leo XIV's Magnifica humanitas (2026), each commemorating an anniversary of Rerum novarum.

The encyclical also inspired Catholic activism and influenced the development of both distributism and corporatism. Socialists generally contest the encyclical's interpretation of socialism; Catholic socialists in particular, interpreting Rerum novarum as not rejecting socialism, argue that divine law justifies the abolition of private property and emphasize the encyclical's anti-capitalist character.

Composition

The first draft and content of the encyclical was written by Tommaso Maria Zigliara, professor from 1870 to 1879 at the College of Saint Thomas (rector after 1873), a member of seven Roman congregations including the Congregation for Studies, and co-founder of the Pontifical Academy of Saint Thomas Aquinas in 1879. Zigliara's fame as a scholar at the forefront of the Thomist revival was widespread in Rome and elsewhere. In addition to Rerum novarum, which elicited the strongest response in the United States, Zigliara had contributed to the drafting of the encyclical Aeterni Patris (1879), which addressed modern science and attempted to advance the revival of Scholastic philosophy; he was a strong opponent of traditionalism and ontologism, favoring instead the moderate philosophical realism of Thomas Aquinas, and was with Giuseppe Pecci one of the Thomist cardinals of Leo.

The encyclical was made possible by the writings of the precursors of economic personalism, in particular the Jesuit fathers Luigi Taparelli D'Azeglio and Matteo Liberatore. The latter was one of the authors of the document together with the Dominican Cardinal Tommaso Maria Zigliara. In drafting the encyclical, the Pope requested the collaboration of the then secretary for Latin letters Vincenzo Tarozzi. The German theologian Wilhelm Emmanuel von Ketteler and the British Cardinal Henry Edward Manning were also influential in its composition. Manning, who was a significant contributor to the development of the encyclical, encouraged English Catholics to engage in politics and seek economic justice, even going so far as to support the 1889 London dock strike.

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