[quote=wabrams]So what everyone is basically saying that if a couple uses NFP so they won’t have any more kids, then this is sinful?
What we are saying is that NFP can be used **only ** for serious reasons. If the couple does not have a serious reason to use it then yes, they might be sinning.
Serious reasons can only be determined through prayer, discernment, and proper conscience formation. It is specific to the couple. But, serious means serious-- not frivolous.
Proper conscience formation should begin with the Catechism and encyclicals such as Casti Conubii and Humanae Vitae. The Church provides much specific guidance for couples:
2367 Called to give life, spouses share in the creative power and fatherhood of God. “**Married couples should regard it as their proper mission to transmit human life ** and to educate their children; they should realize that they are thereby cooperating with the love of God the Creator and are, in a certain sense, its interpreters. They will fulfill this duty with a sense of human and Christian responsibility.”
2368 A particular aspect of this responsibility concerns the regulation of procreation. For just reasons, spouses may wish to space the births of their children. **It is their duty to make certain that their desire is not motivated by selfishness but is in conformity with the generosity appropriate to responsible parenthood. Moreover, they should conform their behavior to the objective criteria of morality: **
When it is a question of harmonizing married love with the responsible transmission of life, the morality of the behavior does not depend on sincere intention and evaluation of motives alone; but it must be determined by objective criteria, criteria drawn from the nature of the person and his acts criteria that respect the total meaning of mutual self-giving and human procreation in the context of true love; this is possible only if the virtue of married chastity is practiced with sincerity of heart.