To speak truly, few adult persons can see nature. Most persons do not see the sun. At least they have a very superficial seeing. The sun illuminates only the eye of the man, but shines into the eye and the heart of the child. The lover of nature is he whose inward and outward senses are still truly adjusted to each other; who has retained the spirit of infancy even into the era of manhood. His intercourse with heaven and earth become part of his daily food. In the presence of nature a wild delight runs through man, in spite of real sorrows.
Ralph Waldo Emerson, Essay on Nature (1836)