From the conclusion to Wittgenstein's Tractatus Logico-Philosophicus:
"6.54 My propositions are elucidatory in this way: he who understands me finally recognizes them as senseless, when he has climbed out through them, on them, over them. (He must so to speak throw away the ladder, after he has climbed up on it.)
He must surmount these propositions; then he sees the world rightly.
7 Whereof one cannot speak, thereof one must be silent."
Teachers are good only insofar as they recognize that, far from being a sign of their failure, it is the highest fulfillment of their function when a student is able to throw away the ladder.
"6.54 My propositions are elucidatory in this way: he who understands me finally recognizes them as senseless, when he has climbed out through them, on them, over them. (He must so to speak throw away the ladder, after he has climbed up on it.)
He must surmount these propositions; then he sees the world rightly.
7 Whereof one cannot speak, thereof one must be silent."
Teachers are good only insofar as they recognize that, far from being a sign of their failure, it is the highest fulfillment of their function when a student is able to throw away the ladder.