Existentialism as Humanism: An Interpretation of Sartre’s Philosophy of Freedom and Responsibility

In Existentialism Is a Humanism, Jean‑Paul Sartre outlines the fundamental principles, the alpha and omega, of existentialist philosophy. He begins his iconic lecture with the central claim that existence precedes essence, asserting that human beings first exist and only later define their essence through their choices, attitudes, and actions. According to Sartre, individuals must therefore assume full responsibility for the decisions they make, leaving no room for predetermined values or moral codes imposed by society or religion. In this sense, existentialism emphasizes subjective freedom and moral autonomy. Sartre further argues that existentialism does not lead to despair or nihilism. On the contrary, it empowers individuals by making them the creators of their own destiny. By declaring that life has no inherent or pre-given meaning, Sartre does not suggest that life is futile; rather, he insists that each person must create meaning through authentic commitment and action. Freedom thus becomes the central principle of existentialism, yet this freedom is inseparable from immense responsibility. Every individual, through their choices, implicitly affirms values not only for themselves but for humanity as a whole. Responding to critics who accuse existentialism of promoting moral chaos, Sartre defends the deeply humanistic character of his philosophy. He emphasizes existentialism’s concern with human reality, personal freedom, and ethical responsibility. Rather than endorsing moral nihilism, Sartre argues that existentialism calls for a profound ethical awareness grounded in individual responsibility rather than externally imposed moral systems. Consequently, it encourages individuals to develop an authentic moral code through conscious choice and responsible action.