Alain Badiou admires Jacques Lacan's constant re-elaboration of the distinction between truth and knowledge, the concomitant desubstantialization of truth, as well as Lacan's voracious enthusiasm for mathematical formalization as well as linguistic invention. Referring to Plato's speculative parricide of Parmenides, Badiou confesses that it is as a faithful son of parricide that comes to philosophy. The discourse of psychoanalysis that which it thinks is not appropriated by philosophy, but comes to function as one of its conditions. It persists in name only under sway of a suture, as a university discourse that, as Lacan noted, is designed to make sure that thought never has any repercussions. Yet philosophy is the discourse that should make sure that what pertains to such a thought, that it happens, that it has form and that it convokes its subject, is retained in such a way that it has had such repercussions.