The pressing need of devoting ourselves to the consideration of the one thing necessary is especially manifest in these days of general chaos and unrest, when so many men and nations, neglecting their true destiny, give themselves up entirely to acquiring earthly possessions, failing to realize how inferior these are to the everlasting riches of the spirit. And yet St. Augustine's saying is so clearly true, that "material goods, unlike those of the spirit, cannot belong wholly and simultaneously to more than one person." The same house, the same land, cannot belong completely to several people at once, nor the same territory to several nations. And herein lies the reason of that unhappy conflict of interests which arises from the feverish quest of these earthly possessions.
On the other hand, as St. Augustine often reminds us, the same spiritual treasure can belong in its entirety to all men, and at the same time to each, without any disturbance of peace between them. Indeed, the more there are to enjoy them in common the more completely do we possess them. The same truth, the same virtue, the same God, can belong to us all in like manner, and yet none of us embarrasses his fellow-possessors. Such are the inexhaustible riches of the spirit that they can be the property of all and yet satisfy the desires of each. Indeed, only then do we possess a truth completely when we teach it to others, when we make others share our contemplation; only then do we truly love a virtue when we wish others to love it also; only then do we wholly love God when we desire to make Him loved by all. Give money away, or spend it, and it is no longer yours. But give God to others, and you possess Him more fully for yourself.
FR. GARRIGOU-LAGRANGE, Excerpt from The Three Conversions of the Spiritual Life