From Tractatus Logico-Philosophicus by Ludwig Wittgenstein:
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.
From The Tao of Jeet Kune Do by Bruce Lee:
Again let me remind you Jeet Kune Do is just a name used, a boat to get one across, and once across it is to be discarded and not to be carried on one's back.