We do lean from our mistakes and not on those good or positive outcomes because these are the results out of those mistakes that we are trying out to correct which it is really just that indeed right that we do learn
from our mistakes and this is something a career which you would really be needing that continuous learning which is something that inevitable or something that you should need to embrace.
Some people are really that easily get discourage on the time that you would really experiencing losses and completely stop on what you are doing unlike on other people
who doesnt really easily quit despite of those errors and mistakes.
Learning from past mistakes is how humanity grows as well, thats the thing that allows us to grow as much as possible. I can tell you two things that history has proven so far, first of all when printing press became widely available, or even started to be used, we started to learn that we can spread information around, and get more information from everywhere, this allowed people to take on previous information and build on top off that, while before that it was harder to pass on information. This allowed past mistakes to be not repeated and start from a good place. Secondly, when Rome was built, they were better than everyone because they learned from mistakes and collected data of it, whereas most others around them just made guesses and had no records kept.