We will always have doubts.
This is especially true if we are seeking greatness, if we are pushing ourselves to be our best, and if we are unwilling to accept mediocrity.
We will doubt our abilities, our potential, and our right to strive for more than what is given.
But doubt is a coward and a bully.
No matter what doubts we have, regardless of how powerful and real they may feel, doubt backs down when confronted with action.