If you're not having doubt, you're not pushing the boundaries far enough. — Tony Fadell Copy Share Image
When you start having doubt, you start creating and atmosphere of 'things are going to go wrong,' and they will. — John Smoltz Copy Share Image
I’m always doubtful. Everything I do is always doubtful. When you’re trying to differentiate, there’s going to be this gut sense, is… — Tony Fadell Copy Share Image
One of the worst feeling in the world is having to doubt something you thought was unquestionable. — Anonymous Copy Share Image
