If, as Heidegger says, thinking is thanking, then one can offer a work of thought as a bit of gratitude. Derrida, on the other hand, repeats the warning of the circle of the gift according to which, in all gift-giving, something is always returned to the giver. The giver always gets a pay back, a return on the investment, if only (or especially) in the most oblique, the most indirect form, of gratitude. Therefore, the purest gift-gifting demands ingratitude, which does not pay the giver back and therefore pay off and nullify his generosity.