Life is like riding a bicycle. You don't fall off unless you plan to stop pedaling. You may have to fight a battle more than once to win it. The word impossible is not in my dictionary. Champions keep playing until they get it right.
Courage is very important.
Like a muscle, it is strengthened by use. When one door shuts, another opens. If you think you can, you can. And if you think you can't, you're right. Lots of folks confuse bad management with destiny.