One would assume that it is based upon the New Testament. You know the sort of thing, feed the hungry, give drink to the thirsty, clothe the naked, shelter the homeless, comfort the sick, visit the prisoner. Sort of what a welfare state is designed to do.
PIUS XI (1922-1939):
Pius XI (1922-1939): "No one can be at the same time a good Catholic and a true socialist."
Socialism, fundamentally contrary to Christian truth
“... For Socialism, which could then be termed almost a single system and which maintained definite teachings reduced into one body of doctrine, has since then split chiefly into two sections, often opposing each other and even bitterly hostile, without either one however abandoning a position fundamentally contrary to Christian truth that was characteristic of Socialism.” (Encyclical
Quadragesimo Anno, May 15, 1931, n. 111)
Socialism cannot be reconciled with Catholic Doctrine
“But what if Socialism has really been so tempered and modified as to the class struggle and private ownership that there is in it no longer anything to be censured on these points? Has it thereby renounced its contradictory nature to the Christian religion? This is the question that holds many minds in suspense. And numerous are the Catholics who, although they clearly understand that Christian principles can never be abandoned or diminished seem to turn their eyes to the Holy See and earnestly beseech Us to decide whether this form of Socialism has so far recovered from false doctrines that it can be accepted without the sacrifice of any Christian principle and in a certain sense be baptized. That We, in keeping with Our fatherly solicitude, may answer their petitions, We make this pronouncement: Whether considered as a doctrine, or an historical fact, or a movement,
Socialism, if it remains truly Socialism, even after it has yielded to truth and justice on the points which we have mentioned
, cannot be reconciled with the teachings of the Catholic Church because its concept of society itself is utterly foreign to Christian truth.” (
Ibid. n. 117)
PIUS IX (1846-1878):
“Overthrow [of] the entire order of human affairs”
“You are aware indeed, that the goal of this most iniquitous plot is to drive people to overthrow the entire order of human affairs and to draw them over to the wicked theories of this
Socialism and
Communism, by confusing them with perverted teachings.” (Encyclical
Nostis et Nobiscum,December 8, 1849)
LEO XIII (1878-1903):
Hideous monster
“...communism, socialism, nihilism, hideous deformities of the civil society of men and almost its ruin.” (Encyclical
Diuturnum, June 29, 1881)
Ruin of all institutions
“... For, the fear of God and reverence for divine laws being taken away, the authority of rulers despised, sedition permitted and approved, and the popular passions urged on to lawlessness, with no restraint save that of punishment, a change and overthrow of all things will necessarily follow. Yea, this change and overthrow is deliberately planned and put forward by many associations of communists and socialists” (Encyclical
Humanum Genus, April 20, 1884, n. 27).
Enemy of society and of Religion
“...there is need for a union of brave minds with all the resources they can command. The harvest of misery is before our eyes, and the dreadful projects of the most disastrous national upheavals are threatening us from the growing power of the socialistic movement. They have insidiously worked their way into the very heart of the community, and in the darkness of their secret gatherings, and in the open light of day, in their writings and their harangues, they are urging the masses onward to sedition; they fling aside religious discipline; they scorn duties; they clamor only for rights; they are working incessantly on the multitudes of the needy which daily grow greater, and which, because of their poverty are easily deluded and led into error. It is equally the concern of the State and of religion, and all good
SAINT PIUS X (1903-1914):
The dream of re-shaping society will bring socialism
“But stranger still, alarming and saddening at the same time, are the audacity and frivolity of men who call themselves Catholics and dream of re-shaping society under such conditions, and of establishing on earth, over and beyond the pale of the Catholic Church, ‘the reign of love and justice’ ... What are they going to produce? ... A mere verbal and chimerical construction in which we shall see, glowing in a jumble, and in seductive confusion, the words Liberty, Justice, Fraternity, Love, Equality, and human exultation, all resting upon an ill-understood human dignity. It will be a tumultuous agitation, sterile for the end proposed, but which will benefit the less Utopian exploiters of the people. Yes, we can truly say that the
Sillon, its eyes fixed on a chimera, brings Socialism in its train.” (Apostolic Letter
Notre Charge Apostolique ["Our Apostolic Mandate"] to the French Bishops, August 25, 1910, condemning the movement
Le Sillon)
More here:
http://www.tfp.org/tfp-home/catholic-perspective/what-the-popes-have-to-say-about-socialism.html