The Israelites who settle outside the promised Land beyond the Jordan build for themselves an ‘immensely great’ altar with the blessing of the high priest. The altar will have no sacrifice offered on it; it will simply remind them of the one true altar before the tabernacle on which the legitimate sacrifice is offered, and of their union with their brethren within the Land (Joshua 22).

An image for the holy souls in purgatory: they are beyond the Jordan of death, they have no sacrifice to offer, and yet they keep ever before their minds the immensely great thought of the one sacrifice offered by their brethren in the Church on earth, by which they are still united to the  land of the living.