Cupido Sciendi

Cupido sciendi — literally "the desire/curiosity to know" — is a phrase Lacan lifts from a moral-philosophical tradition (loosely traceable to Augustine's libido sciendi, the lust of the eyes and the appetite for knowledge) and recruits to name the specific form desire takes when it is organized around the question of knowledge itself. In the context of Seminar 5, the term crystallizes at the point where Lacan is articulating the structural position of the woman in hysteria: she makes herself into a mask, being the phallus rather than having it, and this gesture of self-masking is simultaneously an act of concealment and an incitement to the Other's curiosity. The cupido sciendi names the desire that is provoked by — and inseparable from — a structural opacity: something is withheld, hidden, or encrypted, and this very withholding generates the appetite to know what is behind the mask. It is thus not simple intellectual curiosity but desire structured through a constitutive unknowability.

More precisely, cupido sciendi functions at the intersection of desire and demand as Lacan rigorously reformulates them here. Desire, as the remainder produced by subtracting need from the demand for love, is intrinsically directed at what the Other lacks or conceals. The "desire to know" is not oriented toward an object that could satisfy it; like all desire in the Lacanian framework, it circulates around an absence. The phrase therefore condenses the epistemophilic dimension of desire — already present in Freud's account of the infantile sexual theories and the scopophilic drive — into a single Latin coinage that ties desire structurally to the masquerade, to hysteria, and to the irreducible opacity of the Other's desire.

Cupido sciendi appears once, in jacques-lacan-seminar-5 (p. 364), at a moment when Lacan is consolidating his account of the masquerade and the phallic function. Its immediate theoretical neighbourhood is the triad Need–Demand–Desire: the concept is introduced precisely when Lacan is defining desire as the residue that survives the annulment of both the satisfaction of need and the unconditional appeal of demand. The "desire to know" is offered as the name for that residue in its most concentrated, epistemically charged form — the desire that cannot be resolved by any answer the Other gives, because what drives it is the structural gap in the Other itself. This aligns it squarely with the canonical concept of Desire (desire as structural lack, circling around an indeterminate void) and with Demand (whose unconditional dimension already exceeds any particular satisfaction).

The hysterical context links cupido sciendi to Hysteria and Fantasy: the hysteric constructs a mask (a fantasy-screen) that both conceals and exhibits, provoking the Other's gaze and desire to know. Condensation is relevant at the formal level — the Latin phrase compresses into a single coinage the epistemophilic, erotic, and structural-lack dimensions of desire that Lacan has been elaborating across the seminar. The Master–Slave Dialectic and Dialectics more broadly haunt the concept insofar as the desire to know is always already triangulated through the Other: one wants to know what the Other knows, what the Other wants, what the Other lacks — a dialectical structure in which the subject's curiosity is not self-originating but constituted by the Other's opacity. The concept thus sits at the junction of several canonical axes without being reducible to any single one.

Seminar V · Formations of the UnconsciousJacques Lacan · 1957 (p.364)

This brings us to the heart of what I have perhaps already referred to with this term - borrowed from a morality that despite everything bears the imprint of a human experience ... the Cupido sciendi [the curiosity or desire to know].

The phrase "borrowed from a morality that despite everything bears the imprint of a human experience" is theoretically loaded: it signals that Lacan is not coining the term but re-appropriating one from the tradition (where cupido sciendi named a potentially sinful appetite) and grounding it in the structural-analytic account of desire, insisting that even pre-psychoanalytic moral discourse inadvertently registered something real about the drive to know. The parenthetical gloss "[the curiosity or desire to know]" simultaneously translates and expands the Latin, tying classical epistemophilia directly to Lacan's technical concept of desire as structural lack.