What is the difference between those of superior and inferior capacity in terms of Buddhahood?

When you look at those of superior capacity, do not disparage yourself. The Buddha's true intention was that no one, even those of inferior capacity, be denied enlightenment. Conversely, when you compare yourself with persons of inferior capacity, do not be arrogant and overproud. Even persons of superior capacity may be excluded from enlightenment if they do not devote themselves wholeheartedly. -Nichiren

Wisdom for Modern Life by Daisaku Ikeda 12/8