37 On this point Pope Leo XIII made apt and appropriate comment: "God has commanded that there be differences of classes in the human community and that these classes, by friendly cooperation, work out a fair and mutual adjustment of their interests.'' (11) For it is quite clear that "as the symmetry of the human frame results from suitable arrangement of the various parts of the body, so in a body politic it is ordained by nature that... the classes should dwell in harmony and agreement, so as to maintain the balance of the body politic. Each needs the other: capital cannot do without labor, nor labor without capital. Their mutual agreement will result in the splendor of right order."(12)
Source: Ad Petri Cathedram (Vatican.va)