http://www.ewtn.com/library/theology/libsin.htm ....Liberalism refuses to acknowledge this rational obedience and denies the authority. It asserts the sovereignty of the individual and the social reason, and enthrones Rationalism in the seat of Authority. It knows no dogma except the dogma of self assertion. Hence is it heresy fundamental and radical, the rebellion of the human intellect against God.....
TAKEN FROM CHAPTER 3 - LIBERALISM IS A SIN
Liberalism, whether in the doctrinal or practical order, is a sin. In the doctrinal order, it is heresy, and consequently a mortal sin against faith. In the practical order it is a sin against the commandments of God and of the Church, for it virtually transgresses all commandments. To be more precise: in the doctrinal order Liberalism strikes at the very foundations of faith; it is heresy radical and universal, because (22) within it are comprehended all heresies. In the practical order it is a radical and universa...
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