Patience.
Now i am 57, i have been playing 45 years + and i developed patience through experience...the younger me would never have used it.
But i was orchestrally trained from an early age, so i had great teachers, and lots of repetition of exercises and scales, many were never explained at the time why i had to do them....just do them.
But i wanted to play...not practice scales and studies..i waned to learn new things, work on new ideas...but i was always put back in my place, i felt like i was being held back all the time.
But through the years of all this i could not realize how this would impact my later playing life, i now know that no explanation to me would have satisfied me...so none was offered....why waste time on a child who now better than his teachers?
But patience i did learn, and yes it affects everything i do, even today.
Having the patience to work on what is needed let me move up gears, because i was not focused on short term gains in sklll's, so never got dis-pondent or down when improvement did not come as fast as i expected, or jobs did not come my way first time, i just got on with what i was working on trusting that if i did the work it would all work out.
I have written before, about how i did not notice that some of the things i was working on had been achieved.
This is because we do not gradually get better, so notice the improvement, it is just one day we cannot, the next day we can...and then some more.
We learn in plateaus...not increments that can be measured, but literally play for months and suck, then next day do not...so the patience in this part of leaning helped keep me focused.
In other parts, patience is like an inner trust in my own abilities and skills learned through experience, take the time to enjoy the journey sort of thing,
so i just take everything in my stride rather than rush it or want to make it happen, so patience can be applied to lots of things, so lots of things can benefit from developing/learning some patience...........which i am sure the younger me would never have accepted.