Centesimus Annus §31

³¹ Re-reading this teaching on the right to property and the common destination of material wealth as it applies to the present time, the question can be raised concerning the origin of the material goods which sustain human life, satisfy people's needs and are an object of their rights. The original source of all that is good is the very act of God, who created both the earth and man, and who gave the earth to man so that he might have dominion over it by his work and enjoy its fruits (Gen 1:28). God gave the earth to the whole human race for the sustenance of all its members, without excluding or favouring anyone. This is the foundation of the universal destination of the earth's goods. The earth, by reason of its fruitfulness and its capacity to satisfy human needs, is God's first gift for the sustenance of human life. But the earth does not yield its fruits without a particular human response to God's gift, that is to say, without work. It is through work that man, using his intelligence and exercising his freedom, succeeds in dominating the earth and making it a fitting home. In this way, he makes part of the earth his own, precisely the part which he has acquired through work; this is the origin of individual property. Obviously, he also has the responsibility not to hinder others from having their own part of God's gift; indeed, he must cooperate with others so that together all can dominate the earth. In history, these two factors — work and the land — are to be found at the beginning of every human society. However, they do not always stand in the same relationship to each other. At one time the natural fruitfulness of the earth appeared to be, and was in fact, the primary factor of wealth, while work was, as it were, the help and support for this fruitfulness. In our time, the role of human work is becoming increasingly important as the productive factor both of non-material and of material wealth. Moreover, it is becoming clearer how a person's work is naturally interrelated with the work of others. More than ever, work is work with others and work for others: it is a matter of doing something for someone else. Work becomes ever more fruitful and productive to the extent that people become more knowledgeable of the productive potentialities of the earth and more profoundly cognisant of the needs of those for whom their work is done.