Ens Causa Sui

The ens causa sui (literally "being that is its own cause") names the impossible ideal that Sartre identifies as the fundamental project of human reality: the For-itself's drive to become the In-itself-For-itself — a being that would enjoy both the full positivity and self-sufficiency of the In-itself (brute, contingent facticity) and the self-transparent, free negativity of the For-itself (consciousness, nihilation). This synthesis is structurally impossible because the For-itself is constitutively defined by its not-being the In-itself; it is a "hole of being at the heart of Being," a permanent nihilation. Any closure of that gap would annihilate the For-itself as such. The ens causa sui is therefore not an actual telos but a haunting, regulative ideal — the shape desire takes at the level of fundamental ontology — whose traditional name in theology is "God."

The theoretical move is to extract from this impossibility a universal anthropological claim: the human being is the being whose essence is to pursue a project it structurally cannot complete. Man "loses himself as man in order that God may be born" — but God, the ens causa sui, never is born, and the passion expended is, in Sartre's terms, "useless." The detotalized totality of in-itself and for-itself always presents as a "missing God," a synthesis in permanent disintegration. This ontological structure has ethical consequences: it grounds Sartre's critique of the "spirit of seriousness" (treating values as transcendent givens) and demands that existential psychoanalysis reconstitute the subject's relation to its own project as freely chosen rather than fated.

Both occurrences of ens causa sui appear exclusively in jean-paul-sartre-hazel-barnes-being-and-nothingness-an-essay-on-phenomenological, making it a concept internal to Sartre's phenomenological ontology rather than a term Lacan himself deploys. Its cross-referencing with canonical Lacanian concepts, however, marks the deep structural homologies the corpus registers between Sartrean and Lacanian frameworks. The concept maps most directly onto Lack and Desire: Sartre's ens causa sui is precisely the "impossible object" whose constitutive absence installs desire as permanent want-to-be (manque-à-être). Where Lacan articulates lack as a structural effect of the signifier on the subject, Sartre grounds the same structural void in ontological nihilation — the For-itself's being-what-it-is-not. Both accounts converge on the insight that desire is not an accident of finite beings but their very constitution. The ens causa sui is, in Lacanian terms, the name the For-itself gives to the objet petit a elevated to the status of an absolute — the impossible full object whose loss generates the endless metonymy of desire.

The concept also resonates with Das Ding and the Death Drive: das Ding is the Lacanian name for the impossible-real Thing around which desire endlessly circles without ever reaching it, and it is explicitly associated with the sacred and with God in Seminar VII — an alignment that mirrors Sartre's identification of the ens causa sui with what "religions call God." The death drive's logic of repetition-toward-an-impossible-closure similarly echoes the structure of the human passion Sartre describes. Finally, the concept engages Negation and Phenomenology: the ens causa sui is precisely the ideal produced by internal negation (the For-itself's constitutive not-being-the-In-itself), and Sartre's phenomenological ontology — which the corpus positions as the limit-case that Lacanian structuralism must surpass — here reaches its most extreme formulation, naming the foundational, pre-symbolic project that existential psychoanalysis must decode. Anxiety is the affective correlate: the subject's encounter with the impossibility of the ens causa sui, the moment the gap refuses to close, is precisely the moment anxiety erupts as a signal of the Real pressing in.

Being and Nothingness: An Essay on Phenomenological OntologyJean-Paul Sartre · 1943 (p.615)

the In-itself which escapes contingency by being its own foundation, the Ens causa sui, which religions call God. Thus the passion of man is the reverse of that of Christ, for man loses himself as man in order that God may be born.

The quote is theoretically loaded because it fuses ontological, theological, and libidinal registers in a single formulation: "escapes contingency by being its own foundation" defines the ens causa sui structurally (self-grounding Being, free of external cause), while "the passion of man is the reverse of that of Christ" transforms this ontological analysis into a libidinal economy — human striving is an inverted sacrifice, pouring itself out for a God that never arrives. The term "passion" (suffering-expenditure) links the ens causa sui directly to the death drive and to the structure of desire as constitutively useless.