Gaudium et Spes §71

⁷¹ Since property and other forms of private ownership of external goods contribute to the expression of the personality, and since, moreover, they furnish one an occasion to exercise his function in society and in the economy, it is very important that the access of both individuals and communities to some ownership of external goods be fostered Private property or some ownership of external goods confers on everyone a sphere wholly necessary for the autonomy of the person and the family, and it should be regarded as an extension of human freedom. Lastly, since it adds incentives for carrying on one's function and charge, it constitutes one of the conditions for civil liberties. The forms of such ownership or property are varied today and are becoming increasingly diversified. They all remain, however, a cause of security not to be underestimated, in spite of social funds, rights, and services provided by society. This is true not only of material property but also of immaterial things such as professional capacities. The right of private ownership, however, is not opposed to the right inherent in various forms of public property. Goods can be transferred to the public domain only by the competent authority, according to the demands and within the limits of the common good, and with fair compensation. Furthermore, it is the right of public authority to prevent anyone from abusing his private property to the detriment of the common good. By its very nature private property has a social quality which is based on the law of the common destination of earthly goods. If this social quality is overlooked, property often becomes an occasion of passionate desires for wealth and serious disturbances, so that a pretext is given to the attackers for calling the right itself into question. In many underdeveloped regions there are large or even extensive rural estates which are only slightly cultivated or lie completely idle for the sake of profit, while the majority of the people either are without land or have only very small fields, and, on the other hand, it is evidently urgent to increase the productivity of the fields. Not infrequently those who are hired to work for the landowners or who till a portion of the land as tenants receive a wage or income unworthy of a human being, lack decent housing and are exploited by middlemen. Deprived of all security, they live under such personal servitude that almost every opportunity of acting on their own initiative and responsibility is denied to them and all advancement in human culture and all sharing in social and political life is forbidden to them. According to the different cases, therefore, reforms are necessary: that income may grow, working conditions should be improved, security in employment increased, and an incentive to working on one's own initiative given. Indeed, insufficiently cultivated estates should be distributed to those who can make these lands fruitful; in this case, the necessary things and means, especially educational aids and the right facilities for cooperative organization, must be supplied. Whenever, nevertheless, the common good requires expropriation, compensation must be reckoned in equity after all the circumstances have been weighed.