When you don’t know you can’t
To achieve great and valuable things, you don’t even have to know that you can. You just have to avoid knowing that you cannot.
If you’re sure you can’t, you won’t. When you focus on all the reasons why it won’t work, it won’t work.
Instead, just get busy. Work your way through each challenge, one by one.
Don’t place judgments on your abilities before you even make the effort. Put your considerable skills to use and achieve what you choose to achieve.
The only things impossible for you are the things you consider to be impossible. Focus your time, energy and awareness on what you can do, and let go of thoughts about what you cannot do.