Abstract
Many contemporary political movements focus more on changing the values and principles that people act on in their daily lives rather than institutions and legal frameworks. Political-philosophical theories of justice, however, often focus more on the Rawlsian “basic structure” than the “ethos” of a just society, and rarely discuss how individuals may be encouraged to act in accordance with principles of justice. This article attempts to redress this, and draws on moral, social and political philosophy to argue that an ethos exists in a group or society either i) when its members internalize and act from a particular principle, or ii) when its members uphold a decentralized system of informal social sanctions that increases their compliance with a particular principle.