Here's my favorite...
"To him who has once tasted the reckless independence, the haughty self-reliance, the sense of irresponsible freedom, which the forest life engenders, civilization thenceforth seems flat and stale. It's pleasures are insipid, its pursuits wearisome, its conventionalities, duties and mutual dependence alike tedious and disgusting?The wilderness, rough, harsh, and inexorable, has charms more potent in their seductive influence than all the lures of luxury and sloth. And often he on whom it has cast its magic finds no heart to dissolve the spell, and remains a wanderer and an Ishmaelite to the hour of his death."
-Francis Parkman