56 On the hundredth anniversary of that Encyclical I wish to thank all those who have devoted themselves to studying, expounding and making better known Christian social teaching. To this end, the cooperation of the local Churches is indispensable, and I would hope that the present anniversary will be a source of fresh enthusiasm for studying, spreading and applying that teaching in various contexts. In particular, I wish this teaching to be made known and applied in the countries which, following the collapse of "Real Socialism", are experiencing a serious lack of direction in the work of rebuilding. The Western countries, in turn, run the risk of seeing this collapse as a one-sided victory of their own economic system, and thereby failing to make necessary corrections in that system. Meanwhile, the countries of the Third World are experiencing more than ever the tragedy of underdevelopment, which is becoming more serious with each passing day. After formulating principles and guidelines for the solution of the worker question, Pope Leo XIII made this incisive statement: "Everyone should put his hand to the work which falls to his share, and that at once and straightway, lest the evil which is already so great become through delay absolutely beyond remedy", and he added, "in regard to the Church, her cooperation will never be found lacking".
Source: Centesimus Annus (Vatican.va)