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Order of rank.  There are, first of all, superficial thinkers; secondly, deep thinkers  those who go down into the depths of a thing; thirdly, thorough thinkers; who thoroughly explore the grounds of a thing  which is worth very much more than merely going down into its depths!  finally, those who stick their heads into the swamp: which ought not to be a sign either of depth or of thoroughness! They are the dear departed underground.