Drive, intelligence, and willpower are the three qualities shared by all successful people. People are born with natural abilities in these three areas...or, at least, with various levels of propensities to establish these three qualities. People, to various degrees, are capable of learning and improving in these three areas. 

Drive involves energy and desires. 

Intelligence involves right things at right times.

Willpower involves choices, particularly about self-control.

Success can be short-lived or sustainable. The duration of success is dependant upon the nature of long-term goals and the duration of drive and willpower. Lack of intelligence leads to poor long-term goals. Spasmodic drive and willpower generate, at best, short-lived success. 

To achieve meaningful life-long goals, energy and willpower must be maintained throughout life. Energy and willpower levels do not have to be unfailing, i.e., continuously high. That's unrealistic. Energy ebbs and flows. So, the energy consumers 'drive' and 'willpower' ebb and flow as energy follows cycles of depletion and refreshment. For long-term success, drive and willpower must be sustained at much higher than average levels. 

It takes intelligence to figure out how to sustain high energy levels throughout life.

It takes intelligence to sustain goal-directed drive and goal-directed willpower.

It takes drive and willpower to build intelligence.