--- Vanguard founder Jack Bogle, in a BusinessWeek interview with Christopher Farrell, 27 October 2008
Christopher Farrell: On Wall Street the talk is about return, but both of you emphasize risk.
Bogle: You can control risk. You can't control return. That's up to the beneficence that stock and bond markets are generous enough to bestow on us. That's why we talk about diversification.