Of Grammatology is a monstrous work. One should say that, if possible, in the best sense, which is to say the sense evoked, now famously, in the last sentences of that book's initial chapter, titled “Exergue”:

Monstrous are “wanderings … beyond the closure of knowledge” and it is with just such a wandering, without the security of known and normal compass points, that Derrida makes his way, blindly or monstrously, toward a future for thought and a thought of the future. Wandering, errancy [errance] is the name he will claim again, some two hundred pages later, for the “method” he is following, that is, the path toward the exit from “the closure of knowledge,” of metaphysics: “[This exiting] proceeds in the manner of an errant thinking on the possibility of itinerary and of method. It affects itself [s'affecte] with nonknowledge as with its future and it ventures out [s'aventure] deliberately” (162).