As the ancient Greek philosopher Epicurus put it: “Do not spoil what you have by desiring what you have not; but remember that what you now have was once among the things only hoped for.”
Nikolas Westerhoff, "Set in Our Ways: Why Change Is So Hard," Scientific American, Dec 2008www.sciam.com/article.cfm?id=set-in-our-ways via a tweet from Scobble and ZDNet