ambition

People who do great work are not necessarily happier than everyone else, but they're happier than they'd be if they didn't. In fact, if you're smart and ambitious, it's dangerous

not

to be productive. People who are smart and ambitious but don't achieve much tend to become bitter.

“an ambitious person on an optimal trajectory will often read to the system as an instance of breakage.” – http://paulgraham.com/greatwork.html