"The hearing that is only in the ears is one thing. The hearing of the understanding is another. But the hearing of the spirit is not limited to any one faculty to the ear, or to the mind."

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Hence it demands the emptiness of all the faculties. And when the faculties are empty, then the whole being listens. There is then a direct grasp of what is right there before you that can never be heard with the ear or understood with the mind.

— Zhuangzi