...ideas have a tendency to live lives of their own, and having become a part of tradition, they are very difficult to root out. When summarized in a few neat words or phrases, these gems of wisdom become substitutes for thought, and gradually take on much of the status of revealed truth. Occasionally, some iconoclast sees fit to challenge one of them, and a brief flurry ensues, after which things go on about as before. It is easy to think of plenty of ideas that are passing, if they have not already passed, beyond the stage of effective discussion.