You'll never be brave if you don't get hurt. You'll never learn if you don't make mistakes. You'll never be successful if you don't encounter failure.
Choosing not to be brave enough to tackle the challenges in your life that may end up hurting you, will definitely end up hurting you in the long run when we refuse to even attempt to take those risks. Sometimes the best way to learn is from our own past experiences, and if we have no eye opening experiences that we committed in the past, chances are we are going to encounter future instances and challenges in our lives that we will have to learn from one day.
Going through our lives we have to remember that it sometimes takes knowing how failure may come so that we can best avoid it and receive a victory. Excelling in life means that we must be brave, and that there will be mistakes we make when we are going for what is in our hearts. We don't ever really know what success really means until we have failed before seeing success.