Male protagonist: "You only know what I want you to."
Female protagonist: "I know everything you don't want me to."
As if having read Plato's Pharmacy (Derrida, 1981), Joy Williams and John Paul White articulate the message that the remedy is the poison, and vice versa.
This is to hold back on making explicit a parallel with a particular kind of pedagogic, social relation, such that we might say:
Protagonist One: "Learning is didactic."
Protagonist Two: "Learning is rhizomatic."
Reference
Derrida, Jacques (1981) Plato's Pharmacy, in Dissemination, translated by Barbara Johnson, London, Athlone Press.