Some words of wisdom from management-guru Bob Sutton:
"...virtues of wise people – those who have the courage to act on their knowledge, but the humility to doubt what they know – is one of the main themes in Hard Facts. (...) Perhaps the best description I’ve ever seen of how wise people act comes from the amazing folks at Palo Alto’s Institute for the Future.
A couple years ago, I was talking the Institute’s Bob Johansen about wisdom, and he explained that – to deal with an uncertain future and still move forward – they advise people to have “strong opinions, which are weakly held.” They've been giving this advice for years, and I understand that it was first developed by Instituite Director Paul Saffo. Bob explained that weak opinions are problematic because people aren’t inspired to develop the best arguments possible for them, or to put forth the energy required to test them. Bob explained that it was just as important, however, to not be too attached to what you believe because, otherwise, it undermines your ability to “see” and “hear” evidence that clashes with your opinions. This is what psychologists sometimes call the problem of “confirmation bias.”
Here's a somewhat more elegant variation: "Fierce opinions, briefly held, quietly disowned."