It is the rosebud of sartre. A conference given in front of a hétérogenous people which he wants to like. An assembly very hype worthy of the seminars of Lacan.
There is a certain imposture has to associate humanism and existentialism. This last is naturally individualistic whereas the humanism is a collective project. Manages he to bring closer these two terms. I do not believe. And there is already this obsession to sermonizer. Sartre takes for example the german occupation and the choice of Resistance. He allots the epithet of coward and bastards. However Sartre did not suffer from occupation. His play "The flys" was presented in 1943 with agreement of the German censure.
Curiosly, Sartre did everything so that this text wass occulted. When I was at high-school, we could get it only at Swiss Nagel editor without agreement of Sartre. The version proposed here carefully is re-examined and commented on by his daughter.
At least, he often quotes Heidegger. In fact the great regret of Sartre is not to be Heidegger. That with undoubtedly thorough with all dogmatic excesses which discredited him. The greatest philosopher of after war is Heidegger.