in Thoreau’s Journal:

As it is important to consider nature from the point of view of science, remembering the nomenclature and systems of men, and so, if possible go a step further in that direction,

so it is equally important often to ignore or forget all that men presume that they know, and take an original and unprejudiced view of Nature, letting her make what impression she will on you, as the first men, and all children, and natural men do.