In this confusion (of conflicts between generations) the temptation becomes stronger to risk being swept away towards types of messianism which give promises but create illusions. The resulting dangers are patent: violent popular reactions, agitation towards insurrection, and a drifting towards totalitarian ideologies. Such are the data of the problem. Its seriousness is evident to all. (Papal Encyclical, Populorum Progressio, 26 Mar 1967).