The Resolver of Doubts

is deprived of the use of reason can confect this sacrament and licitly celebrate.
Solution: Because the intention of the minister is required for the consecration of this sacrament, as is clear from the resolution of the first doubt of this article, devotion and self-examination are also required for the celebration, as will be said below. Therefore, if anyone is deprived of the use of reason from any cause whatsoever in such a way that he can never have these, he can neither confect nor celebrate. But if he is rarely deprived of the use of reason and frequently uses it, and no other impediment stands in the way, he can indeed confect and celebrate, provided he has a priest as a helper.
V Whether one possessed by a demon can celebrate.
Solution: If he has been entirely freed, he can celebrate; otherwise, he cannot, which can be proven through experience. The time of probation is arbitrary according to the discretion of the prelate, having weighed the circumstances of the person or dignity or other things of this kind.
Doubt VI Whether one existing in mortal sin can confect this sacrament and licitly celebrate.
Solution: He can confect, but he ought not, because in consecrating he sins mortally. Hence, when he celebrates, he commits two distinct mortal sins. One: because he consecrates unworthily. The other: because he receives unworthily.
VII Whether one about to celebrate is held to be certain that he is not in mortal sin.
Solution: A threefold certainty is found. One is supernatural, which is had only through divine revelation, and such is not required here. Another is natural, by which someone is evidently certain of something through sense or intellect, and that is also not necessary here. The third is moral or civil, which is had neither from divine revelation nor from the evidence of the thing, but from probable conjectures inclining more to one side than the other; and the one about to celebrate in the proposed doubt is held to this, so that, namely, after a diligent and sufficient discussion of conscience, about which below in the chapter...