After reading the title, I want you to think about that, just for a moment. Really why?
The fear of the failure, make it possible in us to avoid that failure again, so why that fear can make a problem for us?
Last paragraph theoretically can be right, but if we change our vision in the practically form, we can reach some other results.
“Fear” Is the answer of our question. Everybody in the world have their personal fears, and something that seems normally for you, can be the fear in my life. The fear of the fire, is due to heat of that. Escape from a tiger, is due to pain of biting. So fear can save our lives with avoiding us from dangerous things.
To reach the best answer for the title question, we should know the fear is divided in two forms, positive, and negative.
With positive of that, humans can save their generation from dangers. But with the negative one, human can lose everything, such as family, job, wealth, and..!
Let me to give an example, in financial market, if you want to start investing, you need the information. With technical, and fundamental analysis, you will find encouraging, and deterrent information that shape reality, and If your mind, and self-confidence has not grown properly, you can not face with your reality that combination with your success, and failures.

You can just reject that “detteren information” Coming from your fear, and failures, or accept it, and facing with your now reality.
When you close your eyes to warn and you have made them look like an annoying thing, your just take a step in the path of failure because you don't have an enough information about that investing condition.
Maybe now we can give the better answer to title's question, consider defeat as a point for the victory
We should not escape from our now reality. Next time you want to make a choice, treat with fear as your best friend!