You will find that in the real world people don't fall into neat categories of smart and disciplined always making the prudent decisions or foolish and undiscip

You will find that in the real world people don't fall into neat categories of smart and disciplined always making the prudent decisions or foolish and undisciplined doomed to failure. It's one of our sillier delusions that being good at one thing (say, for a completely random example not relevant at all to the Hacker News crowd, programming a computer) automatically makes you smart about everything.