If you are in formation to join our order, then you will make solemn promises. Solemn promises is simply the new terminology that was adopted by our order when Pope Paul VI rewrote the constitutions.
The reason he reworded it was to avoid confusion between the vows the Friars Minor, the Poor Clares and the Secular Franciscans. Pope Paul VI felt it was very important for other Catholics to understand that Secular Franciscans are remain secular men and women, even though we belong to a canonical order.
Often when people hear the word vows, they think of either marriage or conventual religious (religious who live in religious houses).
The key here is that in the case of SSPX or any society, they are not a religious family. They cannot have a second or third order. They are an association.
An association is a community of secular priests or lay people. They do not consecrate their lives through a formal profession of vows as do religious orders. They may have associates who do not live in the community.
The Jesuits have associates, Opus Dei, the Christian Brothers, the Sisters of Notre Dame de Namur. These folks make no formal commitment to live the life of the community. They do share in the spirit of the community through its prayer and at times they even participate in its ministry.
If you are contemplating or in formation to join our Order, I hope that you are not an SSPX supporter. If you are, you must mention that to your Minister. St. Francis has a very strong position on this in our rule. Our rule requires absolute and unconditional obedience to the Pope and to St. Francis.
There is no room in our rule for compromises on obedience, except when one is ordered to sin, which is the norm for the universal Church.
To support the SSPX by participating in any of their activities and liturgies is incompatible with the Franciscan vocation, not because of the liturgy, but because of their precarious relationship with the Pope.
St. Francis does not make room in his rule for this kind of relationship. If we examine his life we find that he professed total obedience to the Pope without murmuring, perfect obedience as Christ practiced it.
If one wants to be a Franciscan, Carmelite, Benedictine, or Dominican, the order may demand that one sever all connections with the SSPX. That should be checked out by the candidate.
If one does not mention it to the superior or minister, one runs of the risk of making an invalid profession, that is a grave sin, since secular orders are real religious orders.
As far as I know the only Franciscans not in union with Rome that are legitimate Franciscans are the Anglican Franciscans. That is because they were Franciscans before the birth of the anglican communion. They retain the succession back to Francis. But a Catholic may not join them. They are our brothers and sisters in Christ and St. Francis, but we are not in perfect communion with each other, so we cannot cross over.
JR