If man were wholly ignorant of himself, he would have no poetry in him; for it is impossible to describe what the mind does not conceive. If man clearly discerned his own nature, his imagination would remain idle and would have nothing to add to the picture. But the nature of man is sufficiently disclosed for him to know something of himself, and sufficiently obscure for all the rest to be plunged in thick darkness, in which he gropes forever, and forever in vain, to lay hold on some completer notion of his being.

Of Some Sources of Poetry Among Democratic Nations

Alexis De Tocqueville: Democracy in America, published 1835–1840