From his letter to the U.K. Prime Minister on the occasion of the G8 summit of the world's wealthiest nations:
Moreover, the goal of economics and politics is to serve humanity, beginning with the poorest and most vulnerable wherever they may be, even in their mothers' wombs. Every economic and political theory or action must set about providing each inhabitant of the planet with the minimum wherewithal to live in dignity and freedom, with the possibility of supporting a family, educating children, praising God and developing one's own human potential. This is the main thing; in the absence of such a vision, all economic activity is meaningless.
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(Image of Marshall's classic in economics under Creative Commons License)