In Existentialism and the Wisdom of Nations (a compilation of articles by Simone de Beauvoir, dating from the 1940s), Simone de Beauvoir presents us with specific thoughts that can understand as the “popular wisdom” that must question. Ideas about morality, politics and, in particular, the study of existentialist philosophy, which it criticizes, stating that those who judge existentialism as a “miserabilism” are mistaken and do not understand the proposal, are put under analysis at the vision of the French “scribe”. We can perceive after reading a new defence of the “philosophy of transcendence”, and without forgetting, always rooted in the existentialist ethical question: “to want to be free is to want others free”. And it is these considerations that we will present in this work: A Beauvoirian critique of the popular view on morals, politics and existentialist philosophy itself, based on the existentialist ethical proposal.