Inability to learn from own mistakes.
“For those who do not take full advantage of observation and experience, and who take a longer time than others to learn the lessons of daily life. Whereas one experience would be enough for some, such people find it necessary to have more, sometimes several, before the lesson is learnt. Therefore, to their regret, they find themselves having to make the same error on different occasions when once would have been enough, or observation of others could have spared them even that one fault.” – Dr. Edward Bach
