"I believe that 98 or 99 percent - maybe more than 99 percent - of people who invest should extensively diversify and not trade. That leads them to an index fund with very low costs."
Warren Buffet, August 26, 2007
http://www.getrichslowly.org/blog/2007/08/26/questions-and-answers-with-warren-buffett/

"I'm not saying you have to index everything, but I'm a big proponent of indexing."
William Sharpe, 1990 Nobel Prize in Economics
Heather Bell interview, May 15, 2008
www.indexuniverse.com