Divini Redemptoris §31

³¹ The directive principles concerning the social-economic order have been expounded in the social Encyclical of Leo XIII on the question of labor. Our own Encyclical on the Reconstruction of the Social Order adapted these principles to present needs. Then, insisting anew on the age-old doctrine of the Church concerning the individual and social character of private property, We explained clearly the right and dignity of labor, the relations of mutual aid and collaboration which should exist between those who possess capital and those who work, the salary due in strict justice to the worker for himself and for his family.