So, reading the dogmatic definition of EENS from the Council of Florence, in the bull
Cantate Domino by Pope Eugene IV, a realization struck me that there's a definitive nail in the coffin against so-called "Baptism of Desire" right in that dogmatic definition, at least a BoD meaning that souls can be ultimately SAVED without actual reception of the Sacrament of Baptism. Father Feeney maintained that justification can happen via a Baptism of Desire but not salvation.
Now, even the proponents of BoD must admit that in a BoD scenario, it's still the SACRAMENT of Baptism that supplies the grace, even if it is via the
votum for it. Trent taught right after the infamous "or the desire thereof" passage that the Sacrament of Baptism is the instrumental causes of justification. Otherwise you're a Pelagian heretic who believes that salvation can be achieved
ex opere operantis, and also a heretic for claiming that salvation can be achieved without the Sacraments.
Now, with that in mind, let's have a look at Florence (in the Latin):
[Sacrosancta Romana Ecclesia] ... credit, profitetur et predicat ... tantum que valere ecclesiastici corporis unitatem, ut solis in ea manentibus ad salutem ecclesiastica sacramenta proficient ....
I provide the entire context here, so people can check it, but want to focus on the section above.
https://www.vatican.va/content/eugenius-iv/la/docuмents/bulla-cantate-domino-4-febr-1442.html
Firmiter credit, profitetur et predicat nullos extra ecclesiam catholicam existentes, non solum paganos, sed nec iudeos aut hereticos atque scismaticos eterne vite fieri posse participes, sed in ignem eternum ituros, qui paratus est dyabolo et angelis eius (Mt 25, 41), nisi ante finem vite eidem fuerint aggregati, tantum que valere ecclesiastici corporis unitatem, ut solis in ea manentibus ad salutem ecclesiastica sacramenta proficiant et ieiunia, elemosine ac cetera pietatis officia et exercitia militie christiane premia eterna parturiant, neminem que quantascunque elemosinas fecerit, et si pro Christi nomine sanguinem effuderit, posse salvari, nisi in catholice ecclesie gremio et unitate permanserit.
So, the subject of the verbs at the beginning is the Sacrosanct Roman Church from many paragraphs earlier, with paragraph after paragraph of what the Church "believes, professes, and preaches".
Now let's translate this section ...
[Sacrosancta Romana Ecclesia] ... credit, profitetur et predicat ... tantum que valere ecclesiastici corporis unitatem, ut solis in ea manentibus ad salutem ecclesiastica sacramenta proficient ....
So the Sacrosanct Roman Church "believes, professes, and preaches ... that so much weight (strength / power) does the unity of the ecclesiastical body have that the Sacraments of the Church can profit to salvation for those only who remain in it [the unity of the body].In other words, the Sacraments (including the Sacrament of Baptism) cannot even PROFIT TO SALVATION to those who remain outside the unity of the body, meaning that the Sacrament of Baptism cannot lead to the salvation of any who are not in the unity of the ecclesiastical BODY. This passage alone renders heretical the entire "Soul of the Church" theory, where people can be saved by being in the soul of the Church but not in the body of the Church. Yet BoD can only exist if the Sacrament of Baptism can profit the souls receiving it via the
votum to salvation.
This is 100% game over for BoD theory, since those who are outside the UNITY OF THE ECCLESIASTICAL BODY cannot even be PROFITTED by the Sacrament of Baptism to salvation, and that's the very definition of BoD, where the Sacrament of Baptism somehow profits them to salvation despite the fact that they haven't actually received it. But it's being dogmatically taught here that only those who remain in the unity of the Body of the Church can profit unto salvation from the Sacrament of Baptism.
Now, the one retort by the BoD-promoters would be that the term "remains" refers to people who had once been members of the Church but then actively severed their membership. This is incorrect, as the term is a reference to final perseverance in the unity of the Church, period, and not simply for remaining in the unity of the Church's Body IF you ever achieved it in the first place, i.e. it echoes the earlier phrase that in order to be saved one must have been joined to this unity of the Church before the end of their life ... "nisi ante finem vite fuerit aggregati", unless they will have been joined (aggregated to) the Church before the end of life. So those two passages go together, "unless they will have been joined to the Church before the end of their life and remained in the unity of the Church's body [until death]".