Stocks went on a wild ride Tuesday, with the Dow swinging more than 300 points, and legendary investor Jack Bogle told CNBC that investors should brace themselves for more turbulence and perhaps a significant decline ahead.
But while people should get used to a volatile market, there is one thing they should certainly not do, he said.
"If you're going to jump in and out of anything on a moment's notice, you will be badly defeated. That's a speculative strategy," Bogle, founder of The Vangard Group, said in an interview with "Closing Bell."
"Times of great market turbulence ... are just awful times to make investment decisions."