The quote means to never give up on what you like/love to do. Because once you give up your life is basically over because you gave up on the things that you thought you didn't have the confident to achieve. Whether it's a sport, a decision, big things even little things you need to be confident in your self that you can do it and there are many inspiration out there to motivates you to do this. This quote define me in some ways. I don't give up easily unless if there are reasonable reasons why I should but therefore I should at least give it a try in something that I believe in and it takes practice and knowledge in the things that you want to do. You don't just randomly know or be good at something, it comes from the hard work. But in other words I would like this quote to define me because playing hard in life is sort of a way to your success.