Even the Buddha’s own teachings must be jettisoned, once they had done their job. He once compared them to a raft, telling the story of a traveler who had come to a great expanse of water and desperately needed to get across. There was no bridge, no ferry, so he built a raft and rowed himself across the river. But then, the Buddha would ask his audience, what should the traveler do with the raft? Should he decide that because it had been so helpful to him, he should load it onto his back and lug it around with him wherever he went? Or should he simply moor it and continue his journey?
from Buddha by Karen Armstrong