An extract from 'Dr. Don Felix Sarda Y. Salvany - Liberalism is a Sin'
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'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 within it are comprehended all heresies. In the practical order it is a radical and universal infraction of the divine law, since it sanctions and authorizes all infractions of that law. Liberalism is a heresy in the doctrinal order because heresy is the formal and obstinate denial of all Christian dogmas in general. It repudiates dogma altogether and substitutes opinion, whether that opinion be doctrinal or the negation of doctrine. Consequently, it denies every doctrine in particular. If we were to examine in detail all the doctrines or dogmas which, within the range of Liberalism, have been denied, we would find every Christian dogma in one way or another rejected-from the dogma of the Incarnation to that of Infallibility.'