It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.
This is how I feel lately when it comes to people I’m working with. Trying to convince them things aren’t the way they think it is and they have to prepare to be more agile / flexible, so they can adapt to the ever changing situation that is life, work, etc. Instead of trying to think of every possible outcome and making a plan for it. Above quote reflects it nicely.