One of the principal duties of any government, moreover, is the suitable and adequate superintendence and co-ordination of men's respective rights in society. This must be done in such a way 1) that the exercise of their rights by certain citizens does not obstruct other citizens in the exercise of theirs; 2) that the individual, standing upon his own rights, does not impede others in the performance of their duties; 3) that the rights of all be effectively safeguarded, and completely restored if they have been violated.47Cf. Pius XI's encyclical letter Divini Redemptoris, AAS 29 (1937) 81, and Pius XII's broadcast message, Christmas 1942, AAS 35 (1943) 9-24.
In addition, heads of States must make a positive contribution to the creation of an overall climate in which the individual can both safeguard his own rights and fulfill his duties, and can do so readily. For if there is one thing we have learned in the school of experience, it is surely this: that, in the modern world especially, political, economic and cultural inequities among citizens become more and more widespread when public authorities fail to take appropriate action in these spheres. And the consequence is that human rights and duties are thus rendered totally ineffective.