Mater et Magistra §7

Mater et Magistra: On Christianity and Social Progress

⁷ An outstanding instance of this social teaching and action carried on by the Church throughout the ages is undoubtedly that magnificent encyclical on the christianizing of the conditions of the working classes, Rerum Novarum , published seventy years ago by Our Predecessor, Leo XlIl. (5)

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Source: Mater et Magistra (Vatican.va)