And once again, the sports world offered a powerful lesson for business leaders.

FORBES: Play to Win!

That's the lesson that began a powerful transformation at KONE Americas.

FORBES: Magazine Article

There's a powerful lesson for retail investors in the Treasury's choice.

FORBES: Magazine Article

The lesson here: Twitter is an immensely powerful tool, or weapon.

FORBES: KitchenAid Attacks Obama's Grandmother, Then Apologizes

One lesson that the late 1990s did teach America was the powerful effect on corporate behaviour of short-term moves in share prices.

ECONOMIST: America's business recovery

The lesson from these other countries is that marriage is not the all-powerful salve for poverty that some make it out to be.

FORBES: Bad Relationships Don't Stand in Poor Women's Way. Bad Policies Do.

In my own childhood I learned a hard lesson at a very early age - you can't allow powerful people to bully the weak or to abuse their own power.

BBC: News | UK Politics | Ron Davies's speech in full

The most important lesson of recent crises, Toyota said, was that Toyota should not ever grow too big or powerful as to forget the original spirit of making something from nothing.

NPR: AP Interview: Toyota Chief Stresses Safe Growth