Failures provide opportunities to understand the gaps between what you wanted and and the results you got (internal & external) in any situation.
If you're interested at all in getting better results in the future, you will take the opportunity to seek the root causes for the gaps and then adapt your efforts accordingly.
You'll never get to a destination where all conditions are perfectly in your favor and where some, or all, of those conditions won't change in the next moment. The world always changes around you, therefore, you will always fail on some level and you must constantly seek to improve.
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