Perhaps you can land that job you want.
Perhaps you can outperform your most audacious counterpart.
Perhaps you can come through on that project.
Perhaps you can lose those 10 extra pounds.
But where is the proof?
Running the mental program "I can" is a valuable asset to be sure. Just as long as you can on occasion, back up those claims.
Saying you can is one thing.
Actually showing up and making it happen is an entirely different tale.
If you can, you would. So perhaps you can't.
Either that, or fear is running the show.