"It is not what we learn in conversation that enriches us. It is the elation that comes of swift contact with tingling currents of thought."

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'The difficulty with this conversation,' said Arthur after a sort of pondering look had crawled slowly across his face like a mountaineer negotiating a tricky outcrop, 'is that it's very different from most of the ones I've had of late. Which, as I explained, have mostly been with trees.'

— Douglas Adams