43 Finally, the Church is able to set both public and private life on the road to righteousness by demanding that everything and all men become obedient to God "Who beholdeth the heart," to His commands, to His laws, to His sanctions. If the teachings of the Church could only penetrate in some such manner as We have described the inner recesses of the consciences of mankind, be they rulers or be they subjects, all eventually would be so apprised of their personal and civic duties and their mutual responsibilities that in a short time "Christ would be all, and in all." ( Colossians iii, 11)
Source: Ubi Arcano Dei Consilio (Vatican.va)