“Of all the paths you take in life, make sure a few of them are dirt.” — John Muir
(Another good nature quote! John Muir was probably our greatest naturalist. He and Teddy Roosevelt were our first conservationists. Be well and do good, friends.) — YUR
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Unclerave's Wordy Weblog 
For a guy writing over 100 years ago, this sounds remarkably modern, almost countercultural. Great quote from “John of the Mountains.”