"[I]f we desire to learn for bad reasons (so as to get the upper hand over others, or to win unjust cases), then we will have to change in order to learn, or the fact of learning will change the one who learns. In short, the subject of knowledge will not be the same as the subject of desire. Euthydemus: to teach is to kill — and behind all this emerges the big question that philosophy has not ceased to conceal precisely inasmuch as its birth may not be entirely foreign to it: can knowledge be sold? Can it, on the one hand, be closed up on itself like the precious object of greed and possession? And, on the other hand, can it enter into the game and circulation of wealth and goods?"
