You are sitting comfortably and peacefully on a lawn chair on a ledge behind a waterfall. You can feel a little light spray, but you are perfectly safe. As you watch the water cascading in front of you, you can see some debris from upstream, and something goes by that looks like it might be valuable. But you know if you reach for it, you will have to forgo the pleasure of this experience, strain yourself to catch it, and it might not be of any worth at all. You might even lose your footing. So you just watch it go by. This illustrates that the natural flow of the mind has debris that may
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