.......until you prove it by trying!
I have seen so many people, myself included, that accomplish things they didn't think they could do, and all it took was giving it a try. You will never know unless you try.
So when I ask you to do something you don't think you can do.....when you're thinking I'm nuts...be willing to give it a try! You might be surprised. I often have a better sense of what you can do than you do!