"Mr. Johnson said equality could only be advanced by considering a person's background. "Men and women of all races are born with the same range of abilities. But ability is not just the product of birth."

Mathematically unlikely once you start dividing into sub groups.

However, the rest of the quotation, about a positive environment is needed to realize ones full potential, is not in dispute - though exceptional people have found success despite the lack of a nurturing environment.