10 And I wish to persuade you by an illustration. For I know that many say, what is a soul profited, which departs from this world either with sins, or without sins, if it be commemorated in the prayer? For if a king were to banish certain who had given him offense, and then those who belong to them should weave a crown and offer it to him on behalf of those under punishment, would he not grant a remission of their penalties? In the same way we, when we offer to Him our supplications for those who have fallen asleep, though they be sinners, weave no crown, but offer up Christ sacrificed for our sins, propitiating our merciful God for them as well as for ourselves.
Source: Catechetical Lectures (New Advent)