119 In the first Christian centuries, a number of thinkers developed a universal vision in their reflections on the common destination of created goods. This led them to realize that if one person lacks what is necessary to live with dignity, it is because another person is detaining it. Saint John Chrysostom summarizes it in this way: “Not to share our wealth with the poor is to rob them and take away their livelihood. The riches we possess are not our own, but theirs as well”. In the words of Saint Gregory the Great, “When we provide the needy with their basic needs, we are giving them what belongs to them, not to us”.
Source: Fratelli Tutti (Vatican.va)