"To air one's views gratuitously, is to imply that the demand for them is brisk."

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The second means of attraction which He used is Emptiness, as we see when we place one end of a hollow pipe in water, and draw up it by suction; the water runs up the stem to the mouth, because the emptiness of the pipe, from which the air has been drawn, draws the water to itself.

— Meister Eckhart