Looking at what you did wrong before teaches about what you must do now. Failing again simply implies that you still have things to learn and grow with. Finding the answer causes you to think about your mistakes. It gets you to start again and succeed or fail once more. It’s all a cycle of learning.
Failure allows you to learn that making mistakes is contrary for you to learn how to avoid making mistakes like that again. You can't avoid something if you don't even know where it's coming from, so you need to make the mistake of not avoiding it to know how to avoid it next time.
