45 Indeed, if we long hopefully—as we should—for the realization of this mutual union among the classes of society, then we must do all that we can to bring it about by public and private endeavor and cooperation in courageous undertakings, that all men, even those of the lowest classes, can obtain life's necessities by their toil and by the sweat of their brow, and that they can provide, in an honorable manner and with some degree of sureness, for their future and that of their families. In addition, contemporary progress has made many conveniences an integral part of everyday life; even the poorest citizens may not be excluded from the enjoyment of these advantages.
Source: Ad Petri Cathedram (Vatican.va)