Thomas Aquinas

“ Christ's Passion was sufficiently satisfactory for the sins of the whole world, so that without prejudice to Divine justice something can be remitted from the punishment which a sinner deserves, in so far as the effect of Christ's Passion reaches him through the sacraments of the Church. ”

“ Sometimes, however, the essence of the sacrament requires only sanctification of the matter, as in Baptism, which has no fixed minister on whom it depends necessarily, and then the whole virtue of the sacrament is in the matter. Again, sometimes the essence of the sacrament requires the consecration or sanctification of the minister without any sanctification of the matter, and then the entire sacramental virtue is in the minister, as in Penance. ”

“ Moreover, since satisfactory punishments are medicinal, just as the medicines prescribed by the medical art are not suitable to all, but have to be changed according to the judgment of a medical man, who follows not his own will, but his medical science, so the satisfactory punishments appointed by the canons are not suitable to all, but have to be varied according to the judgment of the priest guided by the Divine instinct. ”

“ This disposition sometimes precedes their Baptism by priority of time, being sufficient for the reception of grace, before they are actually baptized, but not before they have come to the knowledge of the truth and have conceived the desire for Baptism. ”