Sell your losers, hold on to your winners.
SELL THE LOSERS, LET THE WINNERS RUN.
Losers refer NOT to those stocks with the depressed prices but to those whose revenues and earnings aren't capable of growing adequately. Weed out these losers and reinvest the cash into other stocks with better revenues and earnings potential for higher returns.
< I suggest this video: http://www.youtube.com/watch?v=WVqyCRYBieI >
Thanks to Newbie for highlighting this video to me.