Henry George: Morality is the Heart of Economics

Political economy is the simplest of the sciences. It is but the intellectual recognition, as related to social life, of laws which in their moral aspect men instinctively recognize, and which are embodied in the simple teachings of him whom the common people heard gladly. But, like Christianity, political economy has been warped by institutions which, denying the equality and brother-hood of man, have enlisted authority, silenced objection, and ingrained themselves in custom and habit of thought.
— Henry George, Protection or Free Trade.