Dan knows a thing or two about index investing, Burton Malkiel and Jack Bogle.

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Jack Bogle, founder of Vanguard and father of index fund investing, agrees.

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Jack Bogle, founder of Vanguard and father of index investing, warns of the dangers of forecasting, while identifying areas of potential growth in the U.S. economy.

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If prices get ahead of value, they're going to come down back to value--this is Benjamin Graham speaking, this is Warren Buffet speaking, this is even Jack Bogle, little guy, speaking.

FORBES: Intelligent Investing Briefing Book

Unless, apparently, you are Jack Bogle.

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It's always calming in these uncertain times to review the sage advice provided by investing greats such as Benjamin Graham, Warren Buffett, Peter Lynch, David Swenson and Jack Bogle, as well as the words of some gifted academics, many of them Nobel Laureates.

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Mr. JOHN CLIFTON "JACK" BOGLE (Founder, The Vanguard Group): Good to be with you, Scott.

NPR: Bogle: Financial System's Woes Hit 'Real' Economy

Vanguard Group founder John C. (Jack) Bogle uses the simple rule of thumb that investors own a proportion of bonds corresponding to their ages.

FORBES: Retirement