Say not always what you know, but always know what you say.
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All you have to do is write one true sentence. Write the truest sentence that you know.
To know that we know what we know, and to know that we do not know what we do not know, that is true...
Teach thy tongue to say ‘I do not know,’ and thou shalt progress.
Martin Luther King Jr.
August 1, 10 BC - October 13, 54 AD