The activity of man, as it has its origin in man, has man also as its end. Man through his work not only introduces change into things and into society; he also perfects himself. He learns a great deal; he develops his powers; he advances above and beyond himself. This kind of gain, properly understood, is more valuable than any external possessions. Man’s worth is greater because of what he is than because of what he has. In the same way, all that men do to secure greater justice, more widespread brotherhood and a more humane structure of social relationships has more value than advance in technology. Technological development may provide the raw material for human progress, but of itself it is totally unable to bring it into being. The criterion, therefore, for assessing man’s activity is this: does it, in accordance with God’s plan, fit in with the true good of the human race and allow man, individually and corporately, to develop and fulfill his vocation in its entirety?
From the pastoral constitution on the Church in the modern world of the Second Vatican Council