I'm a Professor of Risk. I've come to the conclusion that one of the biggest risks is being too cautious

From Cambridge University's iTunes U:

"I'm a Professor of Risk... and I've come to the conclusion that one of the biggest risks is being too cautious."

David Spiegelhalter

That definition of cautious includes anyone who uses the words "within reason" when it comes to innovation.

Tip of the hat to Andrew Gelman at Columbia and Mr Downes.