The quote is mentioning success, rather in the sense of accomplishments not of financial worth. For example, I could be a billionaire and just hand my fortune t

The quote is mentioning success, rather in the sense of accomplishments not of financial worth. For example, I could be a billionaire and just hand my fortune to my children and someone with a high IQ might never reach that level of economic status. But comparing success in the sense of accomplishments, a high IQ person might have reached certain milestones, for example getting a PhD, maintaining a successful business, moving up to a higher socioeconomic status, etc.