The challenge is to fail.
The challenge is to fail repeatedly.
In this world full of opportunities and options, the biggest challenge is to fail.
You absolutely, positively, cannot fail.
You have to put in delibrate effort to fail.
You have to put in delibrate effort, repeatedly, to fail every time.
You have to do mistakes, be aware of those mistakes, and then repeat those mistakes, to fail - and it is NOT easy.
Try harder, and do new mistakes every time, and you might get "closer" to failing, but you will not fail.
And that is a big problem.
When you know you cannot fail, no matter how much you try, then what happens?
Then you stop learning and growing.
Since you know you are not going to fail, you stop putting in effort to learn and grow.
If you are not learning and growing, then that is not a life worth living for.