This is simply not true. He pointed out that sexuality should be practiced according to it’s augustinian use, and not for enjoyment. Since the only use Augustine sees in sex is procreation, there is no ground for “excessive attachment” argument.
He never said that. Granted, in the quote, the specific “use” of intercourse is never specified. And if I were to interpret the quote in the way you are, that means that
any material thing (that is what the quote is addressing) cannot be enjoyed at all. That means that video games, for example, are only meant to be used not enjoyed. But that doesn’t make any sense. The very use of video games is for enjoyment and they are certainly not a spiritual thing. In that case, the Augustinian quote cautions against an excessive attachment (enjoyment?) of any worldly thing to such a degree that we would forgo heavenly things. This appears to be the only way the quote would make sense, especially considering cases where the use and enjoyment of a thing are not separate. I don’t see how one could use and not enjoy an ice cream cone. De Sales clarifies the context in which invokes the quote: “Let everyone use this world according to his calling, but in such manner that he does not engage his affection in it and remains as free and ready to serve God as if he did not use it.” If we were to follow your interpretation of the quote, to take pleasure in anything nonspiritual (video games, ice cream, conversation, etc.) would be evil. Fortunately the Fathers, even in their sophism, do not takes such a view and neither does de Sales.
It doesn’t seem so from the given quote. The act itself is good, but it must be taken with it’s use in mind- not for enjoyment. Since use is procreation, practicing NFP is attempt to provide enjoyment without usage- and as such, is contrary to logic and morality.
Also, this would be a good time to stress what “infertile” was to theologians of the past. It was what we could describe as “barren” ie. permanently infertile because of sickness or age. A woman in her infertile period of natural cycle is not barren, but fruitful according to this logic.
This is important because when Augustine, or Thomas, approve sex without chance of begetting, they don’t see cycle as something defining woman’s infertility. Accidents define it, and menstrual cycle is not an accident.
I think the meaning of the quote is beyond debate. I will post it hear again in a more convenient translation:
“The procreation of children is the first and principal end of marriage. Hence no one may ever lawfully depart from the due order that that end requires.
This holds even at times when conception cannot take place because of some condition or circumstance as happens when sterility or pregnancy prevents it.
In these occurrences corporal commerce does not cease to be just and holy, provided the rules of generation are followed. No accidental condition whatsoever can injure the law that the principal end of marriage has imposed.”
St. Francis de Sales, while acknowledging procreation as the first end of marriage, explicitly says that even at times when conception cannot take place, “corporal commerce” (intercourse) does not cease to be holy. Clearly a woman who is pregnant is temporarily unable to procreate. St. Francis knew this. But he insists that even at that time intercourse is not sinful.
On a final note, your understanding of the word “accident” is mistaken in this case. “Accident” as used by St. Thomas Aquinas does not share the common meaning, rather it is a scholastic term that describes circumstances as opposed to the term “substance” which speaks of essence. To use St. Thomas Aquinas’ example, sexual relations between two people of the same sex is essentially infertile (that is, by its very nature, by substance). Sexual relations between an infertile man and woman is infertile by accident, that is due to particular circumstances. In the above translation, St. Francis de Sales refers to pregnancy and barreness as “accidental conditions”. It clearly shows Thomistic influence. Accidental, here also, refers to a circumstance.
Infertile periods can also be understood as accidental conditions.