This podcast episode explores the evolution of liberalism, from the contributions of Benjamin Constant and John Stuart Mill to the radical nature of utilitarianism and the impact of Descartes' discoveries. It delves into the personal lives of these thinkers, highlighting their struggles, influences, and relationships, particularly focusing on the intriguing partnership between Harriet Taylor and John Stuart Mill. The episode emphasizes the development of thought and the collaborative work of these individuals in their pursuit of freedom, equality, and social justice.