I feel like he’s describing most of the people I know.
I think that the more you learn the more you (should) realize how little you know.
People can have strange beliefs built entirely on conspiracy theories and be utterly convinced that they know more about a topic than scientists who’ve spent decades researching it. The best is when they have a set of interlocking theories. Then they really know everything. 
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“The darkness shall be the light, and the stillness the dancing.”
— from Four Quartets by T.S. Eliot