My answer: A Come Rain or Shine Attitude
There is a famously watched TED Talk by Angela Lee Duckworth talking about the key to success. Although her example was rooted in experiences with children in school, I think her conclusion applies to absolutely any challenge anyone faces.
The key to success, Duckworth says, is GRIT.
Her talk is very informative and motivational. Check it out. https://embed-ssl.ted.com/talks/angela_lee_duckworth_the_key_to_success_grit.html