Simone Weil had an ambivalent attitude toward Marx. While she thought that the young Marx's celebration of labor had “lyrical accents,” she ultimately believed that Marx had neglected his own insights, embracing a blind worship of mechanization and a theory of history and revolution that was insufficiently attentive to the material conditions of workers. Marx, in her view, was insufficiently materialist and excessively wedded to a hierarchical model of science that maintained the domination of management. Weil and Marx's attitudes toward the dignity of labor and the necessary conditions for socialism are analyzed. The most significant cleavage between them is ultimately due to the differing manner in which they conceive of the relationship between thought and action. Through this comparison, the philosophical underpinnings of the two radically different conceptions of labor and its dignity as a human activity are explained.