  In the second argument for moral liberty, Reid claims that none of our moral practices—our practices of holding ourselves and others accountable for their behavior—would make any sense if we did not believe ourselves and others to be endowed with power over conduct. He claims, in short, that the very concept of a morally accountable being presupposes that that being has power over his conduct. Since we are, he thinks, morally accountable beings, it follows that we are endowed with power over our conduct.