"First, I generally disapprove of changing your ratio in the middle of the stream. All these expectations in the marketplace are often kind of confusing and give you bad signals as an investor," he said. "I would just stay the course at this point."
Bogle also said that bond yields weren't necessarily at a turning point.
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"But certainly there is going to be a turn, and that's what the bond market, I think, is anticipating because we've had a really substantial increase," he said.
Bogle weighed in on emerging markets, noting that they were lower year to date while U.S. equities were up, for a 30 percentage-point spread.
Emerging markets were "a lot cheaper," he said, making for less skepticism at the moment.
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"In the longer run, I'd be more comfortable in emerging markets today, simply because the future returns will be relatively better than the market expects," Bogle added.
— By CNBC's Bruno J. Navarro. Follow him on Twitter @Bruno_J_Navarro.
— CNBC's Patricia Martell contributed research to this report.
Trader disclosure: On Aug. 20, 2013, the following stocks and commodities mentioned or intended to be mentioned on CNBC's "Fast Money" were owned by the "Fast Money" traders: Joe Terranova is long GS; Joe Terranova is long MS; Joe Terranova is long VRTS; Joe Terranova is long OXY; Joe Terranova is long TRV; Joe Terranova is long EMC; Joe Terranova is long SJM; Joe Terranova is long TRIP; Joe Terranova is long SBUX; Joe Terranova is long HOS; Joe Terranova is long AXP; Joe Terranova is long PXD; Joe Terranova is long EOG; Joe Terranova is long CXO; Joe Terranova is long LTD; Joe Terranova is long CAT; Stephanie Link is long AAPL; Stephanie Link is long GS; Stephanie Link is long JPM; Stephanie Link is long WFC; Stephanie Link is long CSCO; Stephanie Link is long FB; Stephanie Link is long EBAY; Josh Brown is long XLU; Josh Brown is long XLF; Josh Brown is long BK; Stephen Weiss is long M; Stephen Weiss is long BAC; Stephen Weiss is long C.