Success
/Failure is the most efficient teacher. It's also the fastest path to success.
On why failure is good (it bears repeating): Thomas Edison invented 1,000s of things but only a couple proved useful (lightbulb, record player). His success was based much more on relentless effort than genius.
Set goals. You won’t achieve all of them but that’s ok.
“Try the best you can, the best you can is good enough” - Radiohead