"Negative capability, that is, when a man is capable of being in uncertainties, mysteries, doubts, without any irritab…" — John Keats

Better to keep your mouth shut and appear stupid than to open it and remove all doubt

When in doubt, don’t

The greatest mistake you can make is to be continually fearing you will make one

When in doubt tell the truth

Only two things are infinite, the universe and human stupidity, and I’m not sure about the former

You can't cross the sea merely by standing and staring at the water

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