Pope Pius XI
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"Pope Pius XI", born "Ambrogio Damiano Achille Ratti", reigned from 6 February 1922 to his death in 1939. He was the first sovereignty/sovereign of Vatican City from its creation as an independent state on 11 February 1929. He took as his papal motto, "Pax Christi in Regno Christi," translated "The Peace of Christ in the Kingdom of Christ."

Pope Pius XI issued numerous encyclicals, including Quadragesimo anno on the 40th anniversary of Pope Leo XIII's groundbreaking social encyclical Rerum novarum, highlighting capitalistic greed (deadly sin)/greed of international finance, and social justice issues, and Quas primas, establishing the feast of Christ the King. The encyclical Studiorum ducem, promulgated 29 June 1923, was written on the occasion of the 6th centenary of the canonization of Thomas Aquinas, whose thought is acclaimed as central to Catholic philosophy and theology. The encyclical also singles out the Pontifical University of Saint Thomas Aquinas/Pontifical University of Saint Thomas Aquinas, Angelicum as the preeminent institution for the teaching of Aquinas: "ante omnia Pontificium Collegium Angelicum, ubi Thomam tamquam domi suae habitare dixeris" (before all others the Pontifical Angelicum College, where Thomas can be said to dwell).

More Pope Pius XI on Wikipedia.

Justice requires that to lawfully constituted Authority there be given that respect and obedience which is its due; that the laws which are made shall be in wise conformity with the common good; and that, as a matter of conscience all men shall render obedience to these laws.

It violates right order whenever capital so employees the working or wage-earning classes as to divert business and economic activity entirely to its own arbitrary will and advantage without, the social character of economic life, social justice, and the common good.

When there is a question of saving souls, or preventing greater harm to souls, We feel the courage to treat with the devil in person.

Communism teaches and seeks two objectives: unrelenting class warfare and the complete eradication of private ownership.