The real sin - perhaps it is a sin against the Holy Ghost for which there is no remission - is the sin of heresy, the sin of thinking for oneself. The saying has been heard before now, here in Spain, that to be a liberal - that is, a heretic - is worse than being an assassin, a thief, or an adulterer. The gravest sin is not to obey the Church, whose infallibility protects us from reason.