Iran's contemporary history is full of bitter experiences of structural degeneration during the Qajar and Pahlavi periods; periods that distanced society from its religious identity and the path of civilizational excellence through adherence to Western models, political tyranny, systematic corruption, and de-Islamization. In contrast to this trend, the Islamic Revolution of Iran in 1979, led by Imam Khomeini (RA) and continued in the thought and management of the Supreme Leader, was considered a turning point in rebuilding the legitimacy, independence, and spirituality of society. The main issue of this research is to explain how society transitioned from the structural degeneration of previous governments to civilizational excellence after the Islamic Revolution. The present research, using a descriptive-analytical approach and a historical-library comparative method, has examined the theoretical foundations, characteristics of Qajar and Pahlavi decadence, and the achievements of the Islamic Revolution in two areas of thought and practice.The research findings show that the pattern of social transformation in Iran after the revolution was based on two components: "religious leadership" and "divine ideology." Imam Khomeini (RA) rejected secularism from the foundation and introduced religion into the context of political power with the theory of Velayat-e-Faqih, thus replacing hereditary royal legitimacy with divine legitimacy. The Supreme Leader also promoted the path of the revolution from the consolidation stage to "Islamic civilization" by explaining the "Declaration of the Second Step of the Revolution" and the strategy of "Jihad of Explanation."