"We do not see the potential costs of the increased risk-taking in some financial markets as outweighing the benefits of promoting a stronger economic recovery and more rapid job creation," Bernanke said today.
In afternoon trading in New York, the Dow Jones Industrial Average rose 0.83 per cent, the Standard & Poor's 500 Index gained 0.29 per cent, while the Nasdaq Composite Index added 0.16 per cent.
"What Bernanke is saying, bottom line, indicates that there will not be a reversal anytime soon in the stimulus program," Peter Cardillo, chief market economist at Rockwell Global Capital in New York, told Reuters.
The Fed chief also reminded lawmakers that the federal spending cuts set to kick in on March 1 if Congress does not reach agreement to avoid them will hamper the economic recovery.
The good news in the US eased concern about the euro zone as Italy is trying to deal with elections that resulted in a split parliament, which risks hampering progress towards solving its national debt crisis and may reignite Europe's sovereign debt crisis too.
Italy's stocks and bonds dropped. The MIB Index tumbled 4.9 per cent. The yield on Italy's 10-year benchmark bond surged 40 basis points.
Europe's Stoxx 600 Index finished the day with a decline of 1.3 per cent from the previous close.