Ralph Waldo Emerson

Emerson was the most important philosopher in the nineteenth century. People said he was the Father of American Transcendentalism or the Father of American Literature.
In the argumentative essay "The American Scholar," he addressed to the scholars of Phi Beta Kapa Society at Cambridge. Emerson talked about that there 's something new happened in this land, and all the scholars, writers had responsibility. He wrote how should a scholar should be educated, and came u three influences: nature, past of mind, and actions.

Nature is everything, like plant is part of nature, including what's in your mind. Nature and soul are related. If you know more about nature, then you get more understanding of yourself too.