Use the Catechism as a guide - it says “JUST reason”.
the Catechism must be understood in light of the other documents …
a “JUST reason” in this matter must be a “serious reason” in order for it to be “just”…
(like for instance one needs a " just reason" to kill a person in self defense…and of course that just reason must by nature be a ‘serious reason’…ie it is necessary to save ones life)
The Church has repeatedly explained that “just reasons” regarding NFP are when there are serious reasons:
From the Compendium of the Catechism of the Catholic Church – approved by Pope Benedict XVI (which summerizes what the Catechism teaches and in some cases sheds more light on what is meant)
- When is it moral to regulate births?
2368-2369
2399
The regulation of births, which is an aspect of responsible fatherhood and motherhood, is objectively morally acceptable when it is pursued by the spouses without external pressure; when it is practiced not out of selfishness but for
serious reasons; and with methods that conform to the objective criteria of morality, that is, periodic continence and use of the infertile periods.
vatican.va/archive/compen…um-ccc_en.html
From the Compendium of Social Doctrine of the Catholic Church
It lays out that
SERIOUS REASONS are needed …and they can fit into different kinds…
(another official doc)
- The family contributes to the social good in an eminent fashion through responsible motherhood and fatherhood, the spouses’ special participation in God’s work of creation[519]. The weight of this responsibility must not be used as a justification for being selfishly closed but must guide the decisions of the spouses in a generous acceptance of life. “In relation to physical, economic, psychological and social conditions, responsible parenthood is exercised both in the duly pondered and generous decision to have a large family, and in the decision, made for **serious reasons **and in respect of the moral law, to avoid for a time or even indeterminately a new birth”[520]. The motivations that should guide the couple in exercising responsible motherhood and fatherhood originate in the full recognition of their duties towards God, towards themselves, towards the family and towards society in a proper hierarchy of values.
vatican.va/roman_curia/po…tt-soc_en.html
The witness of couples who for years have lived in harmony with the plan of the Creator, and who, for proportionately
serious reasons, licitly use the methods rightly called “natural,” confirms that it is possible for spouses to live the demands of chastity and of married life with common accord and full self-giving.
vatican.va/roman_curia/po…emecum_en.html
which is from a vatican guide for confessors
From the Encyclical of Pope John Paul II Evangelium Vitae
This happens when the family is generously open to new lives, and when couples maintain an attitude of openness and service to life, even if, for
serious reasons and in respect for the moral law, they choose to avoid a new birth for the time being or indefinitely.
the larger quote:
The work of educating in the service of life involves the training of married couples in responsible procreation. In its true meaning, responsible procreation requires couples to be obedient to the Lord’s call and to act as faithful interpreters of his plan. This happens when the family is generously open to new lives, and when couples maintain an attitude of openness and service to life, even if, for **serious reasons **and in respect for the moral law, they choose to avoid a new birth for the time being or indefinitely. The moral law obliges them in every case to control the impulse of instinct and passion, and to respect the biological laws inscribed in their person. It is precisely this respect which makes legitimate, at the service of responsible procreation, the use of natural methods of regulating fertility. From the scientific point of view, these methods are becoming more and more accurate and make it possible in practice to make choices in harmony with moral values. An honest appraisal of their effectiveness should dispel certain prejudices which are still widely held, and should convince married couples, as well as health-care and social workers, of the importance of proper training in this area. The Church is grateful to those who, with personal sacrifice and often unacknowledged dedication, devote themselves to the study and spread of these methods, as well to the promotion of education in the moral values which they presuppose. 97
vatican.va/edocs/ENG0141/_INDEX.HTM
BUT AGAIN serious does not have to = life or death…
and it is something that can have MANY incarnations…for life throws all sorts of things at us…
the couple has to judge before God if a particular reason is serious…of course they can seek advice etc…(one source you could contact the Pope Paul VI institute…they can advise and are experts in this area and very faithful to the Church)…but in the end they need to make the judgment …it as in a way a cool …that God puts these sorts of things into our hands…
prayer too of course can be very good…