36 Now if the rich and the prosperous are obliged out of ordinary motives of pity to act generously towards the poor their obligation is all the greater to do them justice. The salaries of the workers, as is just, are to be such that they are sufficient to maintain them and their families. Solemn are the words of Our predecessor, Pius XI, on this question: "Every effort must therefore be made that fathers of families receive a wage sufficient to meet adequately normal domestic needs. If under present circumstances this is not always feasible, social justice demands that reforms be introduced without delay which will guarantee such a wage to every adult working man. In this connection We praise those who have most prudently and usefully attempted various methods by which an increased wage is paid in view of increased family burdens and special provision made for special needs." (Encyclical Letter Quadragesimo Anno. )
Source: Sertum Laetitiae (Vatican.va)