This is a statement about Pope Leo XIII written by Pope Pius XI in his Encyclical Quadragesimo Anno published on May 15, 1931
“That principle which Leo XIII so clearly established must be laid down at the outset here, namely, that there resides in Us [the Papacy] the right and duty to pronounce with supreme authority upon social and economic matters.”
Pope Pius XI, Ecnyclical Quadragesimo Anno, May 15, 1931, paragraph 41
This is a quote from the Council of Trent which was held between the years of 1545 and 1563:
“All temporal power is his; the dominion, jurisdiction, and government of the whole Earth is his by divine right. All rulers of the Earth are his subjects and must submit to him.”
John W. Robbins, Ecclesiastical Megalomania, p. 131
This is a quote from, “The Political Ideas of St. Thomas Aquinas,”
“In order that spiritual matters might be kept separate from temporal ones, the ministry of this [spiritual] kingdom was entrusted not to earthly kings but to priests and expecially to the highest of them, the successor of St. Peter, Vicar of Christ, the Roman Pontiff, to whom all kings must be subject just as they are subject to our Lord Jesus. For those whom the care of an intermediate end pertains should be subject to him to whom the care of the ultimate end belongs be directed by his rule.”
The Political Ideas of St. Thomas Aquinas, p. 100