Evangelii Gaudium §189

189. Solidarity is a spontaneous reaction by those who recognize that the social function of property and the universal destination of goods are realities which come before private property. The private ownership of goods is justified by the need to protect and increase them, so that they can better serve the common good; for this reason, solidarity must be lived as the decision to restore to the poor what belongs to them. These convictions and habits of solidarity, when they are put into practice, open the way to other structural transformations and make them possible. Changing structures without generating new convictions and attitudes will only ensure that those same structures will become, sooner or later, corrupt, oppressive and ineffectual.