The quote "Failure is the key to success; each mistake teaches us something." means even when you make mistakes and fails it teaches you to not make that mistake again. For example, if you get an answer wrong on a test it will teach you to not make the same error again. Once that happened to me and I was able to revise it and did not make that mistake the next time. This quote inspires because it will strive me to do better after making mistakes. Not only for school, but throughout life.