A young student is meditating, and then suddenly jumps up and runs to his teacher. "Master, I have it!", he cried. "That rock is in my head!" and points at a huge boulder.

The master just looks at him. "You must have an awfully large head to fit that great big rock in it."

(Paraphrased from a memory of Reps.)

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Voidness does not mean that things don't exist, and thoughts are things - intangible things, special things, but things nonetheless.