Here's a story about George Dantzig - the famed mathematician, whose contributions to Operations Research and systems engineering have made him immortal.
As a college student, George studied very hard often late into the night. So late, that he overslept one morning, arriving 20 minutes late for Prof. Neyman's class.
He quickly copied the two math's problems on the board, assuming they were the homework assignment. It took him several hours to work through the two problems, but finally he had a breakthrough and dropped the homework on Prof. Neyman's desk the next day.
Six weeks later, on a Sunday morning, his excited professor awakened George at 6 a.m.
Since George was late for class, he hadn't heard the professor announce that the two unsolvable equations on the board were mathematical mind-teasers that even Einstein hadn't been able to answer!
But George Dantzig, working without any thoughts of limitation, had solved not one, but two problems that had stumped mathematicians for thousands of years.
He simply said, "George solved the problems because he didn't know he couldn't ."
A person is limited only by the thoughts that he/she chooses. All you must do is figure out how you can do it, not whether or not you can!