"Some sleep too much....Nowhere do the scriptures say, 'Thou shalt sleep eight hours.' Nor do they say, 'Retire early unless you happen to be a night person.' There must be an excellent reason for the injunction to retire and arise early. ...You will profit by this counsel if you heed it."

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The tao that can be told is not the eternal Tao The name that can be named is not the eternal Name. The unnamable is the eternally real. Naming is the origin of all particular things. Free from desire, you realize the mystery. Caught in desire, you see only the manifestations. Yet mystery and manifestations arise from the same source. This source is called darkness. Darkness within darkness. The gateway to all understanding.

— Laozi