For what two reasons does Eva wish to speak to all their slaves?

Eva is now upon her deathbed, and she asks for all the servants to gather around her bed. She tells the slaves of her belief in Jesus, and asks them to convert to Christianity so that she may see them in heaven. Miss Ophelia, at Eva's request, cuts some of the curls from Eva's head to give to each slave as a remembrance. Topsy then appears suddenly at Eva's bedside; she promises Eva that she is trying, "but, Lord, it's so hard to be good!"