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Roman Catechism
Impurity Is A Filthy Sin
The above-mentioned calamity is indeed common to every mortal sin. But what is peculiar to this sin is that fornicators are said to sin against their own bodies, according to the words of the Apostle: Fly fornication. Every sin that a man doth is without the body; but he that committeth fornication, sinneth against his own body. The reason is that such a one does an injury to his own body violating its sanctity. Hence St. Paul, writing to the Thessalonians, says: This is the will of God, your sanctification; that you should abstain from fornication, that every one of you should know how to possess his vessel in sanctification and honour; not in the passion of lust, like the Gentiles that know not God.
Furthermore, what is still more criminal, the Christian who shamefully sins with a harlot makes the members of Christ the members of an harlot, according to these words of St. Paul: Know you not that your bodies are the members of Christ? Shall I then take the members of Christ and make them the members of a harlot? God forbid. Or know you not, that he who is joined to a harlot is made one body? Moreover, a Christian, as St. Paul testifies is the temple of the Holy Ghost ; and to violate this temple is nothing else than to expel the Holy Ghost.