Joy, Sadness, and the Power to Act

In this lecture, Noa Lahav Ayalon unpacks Spinoza's concept of conatus, the fundamental striving at the heart of human existence, and follows its implications through his entire ethical framework. Beginning with the idea that desire is how we consciously experience this drive to persevere, she examines how Spinoza redefines the relationship between mind and body, departing from both Platonic and Aristotelian traditions. The lecture moves through Spinoza's account of affects, distinguishing actions from passions and showing why "passion" literally means suffering. Ayalon explores how joy increases our power to act while sadness diminishes it, and how three kinds of knowledge (imagination, reason, and intuition) determine whether we are free or in bondage. She addresses the social dimensions of affect, including emotional contagion and competition, before arriving at Spinoza's vision of virtue as mutual flourishing. The lecture culminates in the figure of the wise person, who sees others as friends and lives by the imperative to know thyself.