Christ went down into hell to set free those that were his own. We, too, therefore, should go down there to help our own. For those who are in purgatory are themselves unable to do anything, and therefore we ought to help them. Truly he would be a harsh man indeed who failed to come to the aid of a kinsman who lay in prison, here on earth. How much more harsh, then, the man who will not aid the friend who is in purgatory, for there is no comparison between the pains there and the pains of this world.
--St. Thomas Aquinas
