This decentralised structure may be a source of weakness as banks merge and become more pan-European.

ECONOMIST: Banking on a crisis?

And they understand, most of all, that what makes America great is not just the height of our skyscrapers or the size of our GDP, but it's also our mutual regard for each other and our ability in this incredible diversity that we have to see that as a strength and not a source of weakness, and to be able to bring people together.

WHITEHOUSE: Remarks by the President at a DNC Event in Washington, DC

Rather than a source of economic weakness, this renewed quest for homeownership could underpin a sustainable recovery.

FORBES: New Geographer

In this way, Obama's great strengths--he is a brilliant communicator and image-builder--are also proving to be a source of profound weakness.

FORBES: New Geographer

But increasingly their differences are seen as a source of strength rather than a weakness to be overcome.

BBC: Viewpoint: What if women ruled the world?

Now that first source of systemic weakness plays into a second source - that the way banks of all developed economies finance themselves has become hideously dysfunctional.

BBC: Business

They are not in any way a sign of weakness, and they should never be a source of shame or a cause for stigma. (Applause.) But too often, these conditions are misunderstood or misdiagnosed.

WHITEHOUSE: The White House

The banks remain a source of strength in this market, and are holding us up despite weakness in AAPL. Bank of America (NYSE:BAC) extended higher again yesterday, but now it is difficult to add to longs after the recent move.

FORBES: Looking At Apple And Baidu As The New January Effect Stocks

The main source of the renewed weakness in economic activity seems to be related to a slowdown in international trade, as evidenced by flat export demand seen by Asia, which triggered an involuntary build-up in inventories in the manufacturing sector.

FORBES: Rich Countries Making World Weaker