I found this picture online and I really liked the quote from John Muir. John Muir has become known as the "father of preservation" and "father of the national parks". He was influenced by the wilderness and also by the work of Ralph Waldo Emerson. He even spent the day with him. Muir founded the Sierra Club and overall epitomizes what it means to be connected with the natural world.
Here is a site called the "John Muir Exhibit". Provides information about his life and mission.
John Muir Site

My other favorite John Muir quote is 

"Keep close to Nature's heart... and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean"