Answer:
The author of this quote suggests that ordinary people cannot be trusted to administer a stable government.
Explanation:
In summary, we can say that in the quote shown in the question above, Hamilton claims that the population is divided into groups, the group formed by the most common citizens are just a mass of the people, they do not serve to head large government positions because they lack the necessary intellect to manage a country successfully.
This ability is reserved for the group of the well-born who had access to full education and chances to develop their intellect in a critical and efficient way, being the only ones capable of managing a stable and successful government.