Father of index funds - July 30, 2007 : "Stocks can remain overvalued or undervalued over the years. But with time on the investor's side, he should exercise patience and enter into these stocks at the right time (when they are undervalued) and wait for them to realise their true value over the years. Time is indeed an investor's friend if he is able to utilise this time to his advantage by doing his own research into his watchlist of stocks and waiting for the most opportune time to get invested in some of them when they are undervalued. When the investor is able to do that, he will almost definitely be getting a bargain for his buck and also effectively decreasing his risk-reward ratio. Mr Bogle also once said that the greatest sin of investing is 'to be captured by the siren song of the market, luring one into buying stocks when they are soaring and selling when they are plunging.' Impulse, therefore, is an investor's worst enemy because emotions will come i...