Much of the speech, delivered at the Fed's annual retreat at Jackson Hole, WY, made a case for the effectiveness of the central bank's easy-money policies since 2007, including "nontraditional" actions such as QE1, QE2, and Operation Twist.
The Fed chairman said that the stimulus purchases "have provided meaningful support to the economic recovery while mitigating deflationary risks."
And in a hint to expect more of the same -- namely, QE3 -- Bernanke said that the costs of such policies, "appear manageable, implying that we should not rule out the further use of such policies if economic conditions warrant."
Bernanke also voiced concern over the sluggish economic recovery, and in particular the "painfully slow" improvement of the U.S. unemployment rate, which has changed little in 2012.
That's the sort of bad economic news that has pushed the Fed to take action in the past.