“Perhaps the rebuilding of the body and spirit is the greatest service derivable from our forests, for what worth are material things if we lose the character and quality of people that are the soul of America.” ~ Arthur Carhart, Forest Service Landscape Architect, 1919

To me that one is two parted, and the first could stand perfectly alone. Another great one by him as well:

“If we are to have broad-thinking men and women of high mentality, of good physique and with a true perspective on life, we must allow our populace a communion with nature in areas of more or less wilderness condition.”