‘Private ownership, as we have seen, is the natural right of man, and to exercise that right, especially as members of society, is not only lawful, but absolutely necessary. “It is lawful,” says St. Thomas Aquinas, “for a man to hold private property; and it is also necessary for the carrying on of human existence.”” But if the question be asked: How must one’s possessions be used? – the Church replies without hesitation in the words of the same holy Doctor: “Man should not consider his material possessions as his own, but as common to all, so as to share them without hesitation when others are in need.”`
-Pope Leo XIII, Rerum Novarum No.22
As A Little Child 