"Take rather than give the tone to the company you are in. If you have parts you will show them more or less upon every subject; and if you have not, you had better talk sillily upon a subject of other people's than of your own choosing."

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A man’s ignorance sometimes is not only useful, but beautiful - while his knowledge, so called, is oftentimes worse than useless, besides being ugly. Which is the best man to deal with - he who knows nothing about a subject, and, what is extremely rare, knows that he knows nothing, or he who really knows something about it, but thinks that he knows all?

— Henry David Thoreau