The word
liberal is derived from the Latin
liber, free, and up to the end of the eighteenth century signified only “worthy of a free man”, so that people spoke of “liberal arts”, “liberal occupations”. Later the term was applied also to those qualities of intellect and of character, which were considered an ornament becoming those who occupied a higher social position on account of their wealth and education. Thus
liberal got the meaning of intellectually independent, broad-minded, magnanimous, frank, open, and genial. Again Liberalism may also mean a political system or tendency opposed to centralization and absolutism. In this sense Liberalism is not at variance with the spirit and teaching of the Catholic Church. Since the end of the eighteenth century, however, the word has been applied more and more to certain tendencies in the intellectual, religious, political, and economical life, which implied a partial or total emancipation of man from the supernatural, moral, and Divine order. Usually, the principles of 1789, that is of the
French Revolution, are considered as the Magna Charta of this new form of Liberalism. The most fundamental principle asserts an absolute and unrestrained freedom of thought, religion, conscience, creed, speech, press, and politics. The necessary consequences of this are, on the one hand, the abolition of the Divine right and of every kind of authority derived from
God; the relegation of religion from the public life into the private domain of one’s individual conscience; the absolute ignoring of
Christianity and the Church as public, legal, and social institutions; on the other hand, the putting into practice of the absolute autonomy of every man and citizen, along all lines of human activity, and the concentration of all public authority in one “sovereignty of the people”. This sovereignty of the people in all branches of public life as legislation, administration, and jurisdiction, is to be exercised in the name and by order of all the citizens, in such a way, that all should have share in and a control over it. A fundamental principle of Liberalism is the proposition: “It is contrary to the natural, innate, and inalienable right and liberty and dignity of man, to subject himself to an authority, the root, rule, measure, and sanction of which is not in himself”. This principle implies the denial of all true authority; for authority necessarily presupposes a power outside and above man to bind him morally.
newadvent.org/cathen/09212a.htm