He (who knows it) will keep his mouth shut and
Source: THE TAO AND ITS CHARACTERISTICS
Category: PART II.
He (who knows it) will keep his mouth shut and close the portals
(of his nostrils) He will blunt his sharp points and unravel the
complications of things; he will attemper his brightness, and bring
himself into agreement with the obscurity (of others) This is called
'the Mysterious Agreement'
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