Here are three recent quotes that emphasize the need for us to be evidence-based in our opinions. Presented without further comment.

“Strong views are quite helpful if weakly held.” – Fred Wilson (A VC)

On flip-flopping: “Ideas become part of who we are. People get invested in their ideas, especially if they get invested publicly and identify with their ideas. So there are many forces against changing your mind. Flip-flopping is a bad word to people. It shouldn’t be. Within sciences, people who give up on an idea and change their mind get good points. It’s a rare quality of a good scientist, but it’s an esteemed one.” – Daniel Kahneman (via Morgan Housel)

Update: Barry Ritholtz at the Big Picture on the origins of the phrase “strong opinions, weakly held.”