22. It must in any case be clearly understood that whatever may be laid down by civil law in this matter, man can never obey a law which is in itself immoral, and such is the case of a law which would admit in principle the liceity of abortion. Nor can he take part in a propaganda campaign in favor of such a law, or vote for it. Moreover, he may not collaborate in its application. It is, for instance, inadmissible that doctors or nurses should find themselves obliged to cooperate closely in abortions and have to choose between the law of God and their professional situation.