I don’t know that any real work has been done in the Roman Catholic Church to define ‘liberal’, or ‘conservative’ so I’ve collected definitions of my own. But, let me first start with CalCatholic’s comment. If liberal is on the left and conservative is on the right, then those of us in middle aren’t moderates, but orthodox. The better term is orthodoxy; i.e. in a harmony of conscience to the right rule of faith and the doctrine of the Church. I think you’ll find a definition of it in the CCC. And I disagree with Lutherlic, conservatives do not represent ‘Catholic’, instead they tend to a ‘historicy’ of faith. I’ll try to explain (maybe).
I’ve found that a liberalism is best defined in “Liberalims is a sin”
1. The absolute sovereignty of the individual in his entire independence of God and God’s authority.
2. The absolute sovereignty of society in its entire independence of everything which does not proceed from itself.
3. Absolute civil sovereignty in the implied right of the people to make their own laws in entire independence and utter disregard of any other criterion than the popular will expressed at the polls and in parliamentary majorities.
4. Absolute freedom of thought in politics, morals, or in religion. (see Don Felix Sarday Salvany , “Liberalism Is a Sin”, 1899 - Google it)
I would categorize Protestants, ‘cafeteria Catholics’, and those that still hold a belief in Liberation Theology as liberal Catholics. Many Catholics are deluded into politically liberalism because they confuse their compassion and charity with the political social movements claiming a connection to the beatitudes Matthew (5:3-10). Most of these political movements turn out to be politically progressive, pro-death (abortion), socialists, communists, and Marxist.
Conservative Catholics are sometimes characterized as “traditionalists’. They look to the restoration of liturgical and devotional forms as practiced prior to Vatican II. The only group that I can think of that fits in this category is the sedevacantist SSPX. There seems to be an on again off again schism with this group which frankly I haven’t fallowed – or cared.
Today’s political conservative is the antithesis of political liberal. The conservative relies on religious morals and ethics in policy making on the other hand the liberal relies on his subjective will preempting God’s will, you might say determining for himself what the answers are to the universal questions, (and it’s not 42). I find that the political conservative is most always of religious orthodoxy, primarily because Divine law and Natural law form a moral base for social life. Conversely, the liberal or progressive looks to positive law; in essence positive law makes its own rights, Divine or otherwise, thus the Christian liberal confines God’s will to the Church sanctuary – and depending which church, sometimes it’s the basement. The religious liberal sometimes justifies support for the liberalism on the adage, “the good of the many outweighs the good of the one;” suggesting that this is an axiom of faith implied in Scripture. The problem is that the philosophy doesn’t have Christian roots. In fact, when examined closely is found to be counter to our Christian faith. Hedonism held the philosophy of ‘good is what feels good.’ It was perfected in the School of Epicurus. It’s a philosophy where good and bad are measured by what feels good or what feels bad. The concept was renewed by (Bentham, Jeremy. The Principles of Morals and Legislation, 1789). The philosophy is strictly based on sensual gratification. It seems John Stuart Mill picked up on this philosophy in the mid 1800’s. Mills was an espoused utilitarianism, a variant form of Hedonism.
John Stuart Mill writes, “…happiness is desirable, and the only thing desirable, as an end; all other things being only desirable as means to that end… it necessarily follows that [happiness] must be the criterion of morality, since a part is included in the whole… Happiness is the criterion of right and wrong “John Stuart Mill, Utilitarianism (1863), chap. 4. Such views were founded formulated by Samuel Benthamin the late-1700’s; "the greatest good for the greatest number of people.” The essence of the suggestion is that if it feels good do it, or ‘good is what feels good.’ Today we see this express by the great and wondrous, big-eared, philosopher; the extraterrestrial Sparkanian theology that states, “The good of the many outweighs the good of the one.” The suggestion is nearly the same as the axiomatic Hedonistic value injected into Christian faith and morals. Hedonism is the philosophy of ‘good is what feels good.’ It was perfected in the School of Epicurus and is heretical.
In the same breath, there are those saints among us who are truly servants of their neighbor. They are frequently misled with liberalism’s stress of equality and common ownership of material goods. Forgotten is the movement precisely matches Marxism but with a ‘Christian flare’, ultimately leading to godlessness. As I recalled St. Thomas teaches that what the Christian seeks “is the greatest good is due not to the mere fact that it is pleasure, but to the fact that it is perfect repose in the perfect good.” Also Pope John Paul II taught that good was the word of God “experienced and proclaimed for the good of all.” So, we have good that seeks God, or God’s Truth = the verily good.
PS: Progressivism is the ‘old’ name for Liberalism, not the other way around.
JoeT