Why would Catholics believe that being kind to one's father will bring reparation for sins?

**Sirach 3:12-14** tells us: > 12 My child, support your father in his old age, do not grieve him > during his life. > > 13 Even if his mind should fail, show him sympathy, do not despise him > in your health and strength; > > 14 for kindness to a father will not be forgotten but will serve as > reparation for your sins. From a Protestant perspective (Protestants who hold to the Apostle's Creed, for instance), verse 14 goes against everything in scripture because it teaches that you can do a good deed and it will take care of your sins. But only God can forgive sins. But Sirach is part of the Catholic canon as inspired by God. Do Catholics believe that a Catholic in good standing can do good to one's father as noted in Sirach and have his sins forgiven, or have I misunderstood the "reparation" part of this verse?