Is a man obliged to distribute _all_ his superfluous wealth? As regards the support of human life, Catholic moral theologians distinguish three classes of goods: first, the necessaries of life, those utilities which are essential to a healthy and humane existence for a man and his family, regardless of the social position that he may occupy, or the standard of life to which he may have been accustomed; second, the conventional necessities and comforts, which correspond to the social plane upon which the individual or family moves; third, those goods which are not required to support either existence or social position. Goods of the second class are said to be necessary as regards conventional purposes, but superfluous as regards the maintenance of life, while those of the third class are superfluous without qualification. No obligation exists to distribute the first class of goods; for the possessor is justified in preferring his own primary and fundamental needs to the equal or less important needs of his neighbours. The owner of goods of the second class is under obligation to dispense them to persons who are in extreme need, since the preservation of the neighbour's life is more important morally than the maintenance of the owner's conventional standard of living. On the other hand, there is no obligation of giving any of these goods to meet those needs of the neighbour which are social or conventional. Here, again, it is reasonable that the possessor should prefer his own interests to the equal interests of his fellows. Still less is he obliged to expend any of the second class of goods for the relief of ordinary or common distress. As regards the third class of goods, those which are absolutely superfluous, the proportion to be distributed is indefinite, depending upon the volume of need. The doctrine of the moral theologians on the subject is summed up in the following paragraph.