James Surowiecki:

It’s true that the uncertainty of recessions creates an opportunity for serious profits, and the historical record is full of companies that made successful gambles in hard times.

Then again, the record is also full of forgotten companies that gambled and failed.

Malcolm Gladwell:

Mysteries require judgments and the assessment of uncertainty, and the hard part is not that we have too little information but that we have too much.

Marc C. Taylor:

The alternative to blind belief is not simply unbelief but a different kind of belief -- one that embraces uncertainty and enables us to respect others whom we do not understand. In a complex world, wisdom is knowing what we don't know so that we can keep the future open.

Robert McNamara:

Rationality will not save us.