Magnifica Humanitas §61

⁶¹ In this sense, we can say that the whole is “greater than the sum of its parts” and that, for this very reason, “the mere sum of individual interests is not capable of generating a better world for the whole human family.” Indeed, it is an illusion to think that simply pursuing one’s own progress without caring for others is sufficient for contributing to the good of all. This view ignores the inherent and specific value of the common good, which is the result of an “interdependence” that creates a network of social good that expands and has an impact on people. The common good is a “plus,” the result of interaction and mutual influence that connects various actions, initiatives, efforts and decisions. If we were to add up the individual goods, we could not explain the existence of this “plus” that transcends them and, at the same time, enriches them.