How to theorise the pleasure of thinking? Psychoanalysis is the rare discipline of psychology that has accounted for the pleasure of thinking. Chapter 3 follows a historical presentation of psychoanalysis; it first presents how, when founding psychoanalysis, Sigmund Freud theorised thinking and its pleasure, an experience he obviously himself had. The chapter then explores the two next generations of psychoanalysts. It thus focuses on two post-war authors, Wilfred Bion and Donald Winnicott, who, in very contrasting ways, give us elements to further understand psychic activity and its pleasures. Finally, it examines the work of contemporary theoreticians who, building on Freud, Bion, and Winnicott, turn their interests to the modalities of thinking and, with it, allude also to pleasure (André Green), whether in sublimation (Sophie de Mijolla-Mellor), daydreaming (Thomas Ogden), or the pleasure of insights.