Comment by bigDinosaur

If there's a single unifying fault to the unsuccessful people I know (for any definition of unsuccesful, including my own failures) is that they're precisely bad at working out why they failed - if they even think to ask the question. The successful people are generally much clearer that it was studying hard or networking or natural talent that contributed to their success. The latter group may have people who don't realise luck played a part, but they massively increased their chances of good luck by the aforementioned behaviours.