Nothing comes to my desk that is perfectly solvable. Otherwise, someone else would have solved it. So you wind up dealing with probabilities. Any given decision you make you’ll wind up with a 30 to 40 percent chance that it isn’t going to work. You have to own that and feel comfortable with the way you made the decision. You can’t be paralyzed by the fact that it might not work out.

Barack Obama explaining what it is to be President to Michael Lewis. His predecessor put it less articulately and more succinctly when he said, “I’m the decider.”