The greater the grace, the more abiding it is

The very fact of falling away from the love of God by sin, does not work unto the good of all those who love God, which is evident in the case of those who fall and never rise again, or who rise and fall yet again; but only to the good of “such as according to His purpose are called to be saints,” viz. the predestined, who, however often they may fall, yet rise again finally. Consequently good comes of their falling, not that they always rise again to greater grace, but that they rise to more abiding grace, not indeed on the part of grace itself, because the greater the grace, the more abiding it is, but on the part of man, who, the more careful and humble he is, abides the more steadfastly in grace. Hence the same gloss adds that “their fall conduces to their good, because they rise more humble and more enlightened.”

Thomas Aquinas, Summa Theologica (Part III, Question 89, Article 2, Reply to Objection 1)

Whether dispensing of this sacrament belongs to a priest alone?

 

It is written (De Consecr., dist. 12): “It has come to our knowledge that some priests deliver the Lord's body to a layman or to a woman to carry it to the sick: The synod therefore forbids such presumption to continue; and let the priest himself communicate the sick.”

The dispensing of Christ's body belongs to the priest for three reasons. First, because, as was said above (Article 1), he consecrates as in the person of Christ. But as Christ consecrated His body at the supper, so also He gave it to others to be partaken of by them. Accordingly, as the consecration of Christ's body belongs to the priest, so likewise does the dispensing belong to him. Secondly, because the priest is the appointed intermediary between God and the people; hence as it belongs to him to offer the people's gifts to God, so it belongs to him to deliver consecrated gifts to the people. Thirdly, because out of reverence towards this sacrament, nothing touches it, but what is consecrated; hence the corporal and the chalice are consecrated, and likewise the priest's hands, for touching this sacrament. Hence it is not lawful for anyone else to touch it except from necessity, for instance, if it were to fall upon the ground, or else in some other case of urgency.

Thomas Aquinas, Summa Theologica (Part III, Question 82, Article 3)