This post ponders the requirements for success: Which is better: passion or self-discipline?" and argues in favor of self-discipline.
"Using passion as your only fuel will no more assure you of success than
being in love will ensure a successful long-term relationship... Self-discipline allows you take action and therefore get results no matter what your emotional state."http://www.stevepavlina.com/blog/2005/05/passion-vs-self-discipline/