"We know truth when we see it, from opinion, as we know when we are awake that we are awake."

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Men talk glibly enough about moonshine, as if they knew its qualities very well, and despised them; as owls might talk of sunshine,--none of your sunshine!--but this word commonly means merely something which they do not understand,--which they are abed and asleep to, however much it may be worth their while to be up and awake to it.

— Henry David Thoreau