From Divini Redemptoris:
55. To give to this social activity [that which was recommended in Quadragesimo Anno — J.H.] a greater efficacy, it is necessary to promote a wider study of social problems in the light of the doctrine of the Church and under the aegis of her constituted authority. If the manner of acting of some Catholics in the social-economic field has left much to be desired, this has often come about because they have not known and pondered sufficiently the teachings of the Sovereign Pontiffs on these questions. Therefore, it is of the utmost importance to foster in all classes of society an intensive program of social education adapted to the varying degrees of intellectual culture. It is necessary with all care and diligence to procure the widest possible diffusion of the teachings of the Church, even among the working-classes. The minds of men must be illuminated with the sure light of Catholic teaching, and their wills must be drawn to follow and apply it as the norm of right living in the conscientious fulfillment of their manifold social duties. Thus they will oppose that incoherence and discontinuity in Christian life which We have many times lamented. For there are some who, while exteriorly faithful to the practice of their religion, yet in the field of labor and industry, in the professions, trade and business, permit a deplorable cleavage in their conscience, and live a life too little in conformity with the clear principles of justice and Christian charity. Such lives are a scandal to the weak, and to the malicious a pretext to discredit the Church. (emphasis added)
Divini Redemptoris is an excellent supplement to Quadragesimo Anno and yet another example of the brilliance of Pope Pius XI.