15 The "Personalist" Argument Thus, the principle of the priority of labour over capital is a postulate of the order of social morality. It has key importance both in the system built on the principle of private ownership of the means of production and also in the system in which private ownership of these means has been limited even in a radical way. Labour is in a sense inseparable from capital; in no way does it accept the antinomy, that is to say, the separation and opposition with regard to the means of production that has weighed upon human life in recent centuries as a result of merely economic premises. When man works, using all the means of production, he also wishes the fruit of this work to be used by himself and others, and he wishes to be able to take part in the very work process as a sharer in responsibility and creativity at the workbench to which he applies himself. From this spring certain specific rights of workers, corresponding to the obligation of work. They will be discussed later. But here it must be emphasized, in general terms, that the person who works desires not only due remuneration for his work; he also wishes that, within the production process, provision be made for him to be able to know that in his work, even on something that is owned in common, he is working "for himself". This awareness is extinguished within him in a system of excessive bureaucratic centralization, which makes the worker feel that he is just a cog in a huge machine moved from above, that he is for more reasons than one a mere production instrument rather than a true subject of work with an initiative of his own. The Church's teaching has always expressed the strong and deep convinction that man's work concerns not only the economy but also, and especially, personal values. The economic system itself and the production process benefit precisely when these personal values are fully respected. In the mind of Saint Thomas Aquinas , this is the principal reason in favour of private ownership of the means of production. While we accept that for certain well founded reasons exceptions can be made to the principle of private ownership-in our own time we even see that the system of "socialized ownership" has been introduced-nevertheless the personalist argument still holds good both on the level of principles and on the practical level. If it is to be rational and fruitful, any socialization of the means of production must take this argument into consideration. Every effort must be made to ensure that in this kind of system also the human person can preserve his awareness of working "for himself". If this is not done, incalculable damage is inevitably done throughout the economic process, not only economic damage but first and foremost damage to man.
Source: Laborem Exercens (Vatican.va)