The aim of this article is to argue that Marcel’s idea of freedom as participation in being is what constitutes authentic freedom and existence. A “pessimistic” existentialist, Sartre conceives of authentic freedom and existence or life as making free choices and committing oneself to one’s chosen mode of life and taking responsibility for it. However, this stand of absolute freedom of choice, irrespective of the morality and nature of one’ actions with regard to human essence and ontological status as finite (...) and potential being in need of plenitude, could lead to the loss of sense of being and the proliferation of evil in a society. This is because one might freely choose to indulge in an act that negates the essence of humanity and engenders self-destruction as well as the destruction of others, since, for the “pessimistic” existentialist, one only has to be committed to it and accept its accompanying responsibility to qualify as authentic freedom and existence. I will argue that Marcel’s conception of freedom as participation in being leads to an individual’s awareness of their ontological status as a finite being and that their finitude imposes a limitation on their hold on being and generates some self-trepidation that they might lose their sense of being, and consequently propels them to engage in those acts that are consistent and compatible with their essence and are geared towards self-realisation. I will conclude that genuine freedom and authentic life lie in participation in being. (shrink)