Encyclical Quadragesimo Anno, § 128
pope of the Catholic Church from 1922 to 1939
Pope Pius XI (Italian: Pio XI), born Ambrogio Damiano Achille Ratti (Italian: [amˈbrɔ:dʒo daˈmja:no aˈkille ˈratti]; 31 May 1857 – 10 February 1939), was head of the Catholic Church from 6 February 1922 to his death in 1939. He was the first sovereign of Vatican City from its creation as an independent state on 11 February 1929. He assumed as his papal motto "Pax Christi in Regno Christi," translated "The Peace of Christ in the Kingdom of Christ." Pius XI issued numerous encyclicals, including Quadragesimo anno on the 40th anniversary of Pope Leo XIII's groundbreaking social encyclical Rerum novarum, highlighting the capitalistic greed of international finance, the dangers of socialism/communism, and social justice issues, and Quas primas, establishing the feast of Christ the King in response to anti-clericalism.
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Venerable Brethren and Beloved Sons, having surveyed the present economic system, We have found it laboring under the gravest of evils. We have also summoned Communism and Socialism again to judgment and have found all their forms, even the most modified, to wander far from the precepts of the Gospel.
The true Christian does not renounce the activities of this life, he does not stunt his natural faculties; but he develops and perfects them, by coordinating them with the supernatural. He thus ennobles what is merely natural in life and secures for it new strength in the material and temporal order, no less then in the spiritual and eternal.