Which is better ? Smartness (I.Q) or Motivation....Looks like during the study days IQ is important but while searching for a job or in job, Motivation matters!
The science of success: Blood, or sweat and tears? - life - 06 March 2014 - New Scientist

The science of success: Blood, or sweat and tears? - life - 06 March 2014 - New Scientist