This quote means that if you want to be successful, you should be more motivated to achieve success than worried about failing. In other words, having a strong desire to succeed is more important than worrying about not being successful. To put it another way, if you want to be successful, it’s important to focus on the positive aspects of success, rather than worrying about the possibility of not succeeding. The goal should be to stay motivated to accomplish your goals and remain positive, rather than letting fear of failure prevent you from trying.