"All political revolutions, not affected by foreign conquest, originate in moral revolutions. The subversion of established institutions is merely one consequence of the previous subversion of established opinions"

John Stuart Mill is suggesting that all political transformations, which are not triggered by foreign conquest, are rooted in ethical revolutions. This suggests that the subversion of recognized organizations is an outcome of the subversion of recognized viewpoints. In other words, when people's opinions and beliefs change, it can cause a change in the political system. This is due to the fact that people's viewpoints and beliefs are the foundation of the political system. Therefore, when people's opinions and beliefs change, it can result in a change in the political system. This is why Mill believes that all political revolutions, which are not caused by foreign conquest, originate in ethical revolutions.