"Don’t Look for the Needle — Buy the Haystack"
Bogle’s insight was plain and subversive: rather than laboring to pick the few stocks that beat the market (the needle in the haystack), simply buy the whole market (the haystack itself). Since over the long run almost no one can consistently beat the market, own the market itself at the lowest possible cost. This "silly idea," mocked by peers in its day, finally set off an investing revolution that benefited billions of ordinary people.