Human is a creature learning from experience and mistakes. For example, when U were still a kid, U did a maths for 5 + 6. At that time, U counted your fingers wrong. U put 10 instead of 11. Maybe, U forgot to add on after counting to 10 or U did not concentrate to count your fingers. Therefore, in the next time, U would pay more attention to do the maths with fingers especially add-on is necessary. As a result, you would get a correct answer in the next time.

Although our life is not so simple like doing 5 + 6, it is also similar as learning from mistake. For example, U made an mistake in deciding an issue that U were failure on that and U were fortunate enough to get a chance again to handle this issue again. Then, U also learnt from experience and performed a better play in the next time. In the meantime, U also noticed that the worse in your failure U've experienced, the more careful and better play in the next time.

However, did U also notice that one thing which is called "over". Don't ever think that perform too good maybe not a good thing. It's just made the situation worse. Once U made mistake before, then U will do too much to avoid all the mistakes. Then, U just concentrate to avoid those mistake and forgot what it should be like at last. As a result, U still cannot do the thing well.

I know this is quite hard to determine the level we should reach that we correct our past and improve ourselves. But I think that we can think in this way: if the whole picture was really improved itself after your correct operations done, then it is ok and fine. If the whole picture was actually worse than before after your correct operations done, then U know what to do.