In this foundational work, bestselling author Stéphane Etrillard explores the facets of a confident personality. Through practical examples, he demonstrates how to achieve greater confidence in the professional environment, leading to an improved quality of life. The author skillfully connects expert information from the fields of psychology, philosophy, and linguistics with his practical experiences from working with thousands of seminar participants, as well as the life stories of real personalities like Coco Chanel, Johnny Cash, Gertrude Stein, and Alice Herz-Sommer. What distinguishes a confident personality is, above all, the willingness to learn from other successful individuals.