[knowtheory]

Honestly, this is what people mean when they talk about passion or tenacity or being "an animal" (cf http://www.paulgraham.com/start.html ).

What they mean is that you've got a drive to succeed in the face of adversity. That when you encounter difficulty, you won't become disheartened and lose focus on your goal and instead browse reddit for the next 12 hrs (There's some irony in Y-Combinator being responsible for one of the biggest time wasters on the internet). That when faced with a problem you'll take it head on, or if it's more sensible find a way to go around it.

This is a concept that's both maddeningly simple and insanely challenging.