148. The reason why what is man's own (and indeed an Own which is dear to him) is called a "rib" which is a bone of the chest, is that among the most ancient people the chest signified charity, because it contains both the heart and the lungs; and bones signified the viler things, because they possess a minimum of vitality; while flesh denoted such as had vitality. The ground of these significations is one of the deepest arcana known to the men of the most Ancient Church, concerning which of the Lord's Divine mercy hereafter.