Herman Melville: Thinkers and divers

Now, there is a something about every man elevated above mediocrity, which is, for the most part, instinctuly perceptible. This I see in Mr Emerson. And, frankly, for the sake of the argument, let us call him a fool; — then had I rather be a fool than a wise man. — I love all men who dive. Any fish can swim near the surface, but it takes a great whale to go down stairs five miles or more; & if he don’t attain the bottom, why, all the lead in Galena can’t fashion the plumet that will. I’m not talking of Mr Emerson now — but of the whole corps of thought-divers, that have been diving & coming up again with bloodshot eyes since the world began. [Letter to Evert Duyckinck, March 3 1849]