What is Existentialism? It is perhaps the most misunderstood of modern philosophic positions - misunderstood by reason of its broad popularity and general unfamiliarity with its origins, representatives, and principles. Existential thinking does not originate with Jean Paul Sartre. It has prior religious, literary, and philosophic origins. In its narrowest formulation it is a metaphysical doctrine, arguing as it does that any definition of man's essence...