Chapter from Deleuze and the Passions, edited by Ceciel Meiborg and Sjoerd van Tuinen. In recent years the humanities, social sciences and neuroscience have witnessed an ‘affective turn,’ especially in discourses around post-Fordist labor, economic and ecological crises, populism and identity politics, mental health, and political struggle. This new awareness would be unthinkable without the pioneering work of Gilles Deleuze, who replaced judgment with affect as the very material movement of thought: every concept is an affective experience, a becoming. Besides entirely active affects, the highest practice of thought, there is no thought without passive affects or passions. Instead of a calm and rational philosophy of passions, Deleuzian th...