“Any person, who has made observations on the state of progress of the human mind, by observing his own, cannot but have observed that there are two distinct classes of what are called Thoughts: those that we produce in ourselves by reflection and the act of thinking, and those that bolt into the mind of their own accord. I have always made it a rule to treat these voluntary visitors with civility, taking care to examine, as well as I was able, if they were worth entertaining; and it is from them I have acquired almost all the knowledge that I have. As to the learning that any person gains
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