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Before I address your quote there is a small complaint I must make. Forgive me and I hope you take it assuming my best intentions (with the hope that if I ever forget you might grant me the same grace). When you addressed the quote to MaryGrail, you did not provide a source for the quote (at least what document it is from). Therefore it is difficult for her or for others who might want to address your point to do so with satisfaction because they can’t find what context it’s from. But I will assume it’s from Pope Pius XI’s Encyclical Casti Connubii.Well then how would you explain his other quotes I posted? Or the quote by Pope Pius XI?![]()
In the aforementioned encyclical, Pope Pius XI only deals directly with contraception a short time. But in that section that he does, he says this:
Pope Pius XI said:Nor are those considered as acting against nature who in the married state use their right in the proper manner although on account of natural reasons either of time or of certain defects, new life cannot be brought forth. For in matrimony as well as in the use of the matrimonial rights there are also secondary ends, such as mutual aid, the cultivating of mutual love, and the quieting of concupiscence which husband and wife are not forbidden to consider so long as they are subordinated to the primary end and so long as the intrinsic nature of the act is preserved.
Castii Connubii
LittleDeb with great kindness has already provided the link to the encyclical so I won’t post it again.
This paragraph contradicts your own conclusions. It implies (at least) that periodic continence is morally permissible. It also says clearly that “the use of matrimonial rights” are not for procreation only, but also that there are “secondary ends” such as “the cultivating of mutual love”. He maintains only that the act be ordered to its primary end—procreation. This mention of secondary ends is important because Pope Pius XI is the first pope (that I know of) to mention them so explicitly (although the Council of Trent does says something of them).
Now looking at your quote, I think that what Pius XI is saying when he says “deliberately frustrate” is an active action against conception. That is to say, it is not permissible to render an act infertile which would otherwise (most likely) be fertile or to alter the marital act through the inclusion of objects. Such is the chief difference between NFP and contraceptives.