It is not so much for its beauty that the forest makes a claim upon men's hearts, as for that subtle something, that quality of air that emanates from old trees, that so wonderfully changes and renews a weary spirit.
Source, in full
in "Forest Notes" (1875-1876) "Morality" also in "The Works of Robert Louis Stevenson, Vol. IX : Essays and Reviews (1906)" edited by Charles Curis Bigelow and Temple Scott, p. 133, quoted in Raven Kaldera Moon phase Astrology: The Lunar Key to Your Destiny, Inner Traditions / Bear & Co, 28 March 2011 , p. 29.