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Peter Jackson's The Hobbit movie has recently come out, and it comes with a neat quote provided by Bilbo Baggins about this trope that I think would work well for the page:
"Thror's love of gold had grown too fierce. A sickness had begun to grow within him. It is a sickness of the mind...and where sickness thrives, bad things will follow."
Whether or not it's put on the main page, I've put it on the "Quotes" page for good measure.
Examples need details. Please see How To Write An Example before moving these examples back to Main. "Two words" is a tired bit of Word Cruft, leaving very little indeed. Remember the reader may never have heard of the word before now but the example still needs to work.
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How well does it match the trope?