rights of humanity
Since "the people" have no clout (in the form of professorships, pensions, membership in academies), then who will speak for them? Rousseau asks the same question in his unpublished fragment on "The State of War."
The implication here is that because Emile has been sheltered from the competitiveness and veniality of public life, he will more clearly perceive the people's true interests and be able to speak up for them. Yet the reference to an author who does "not pay court to those in authority" but establishes "the rights of humanity" might also suggest Rousseau himself.
At this point one might wonder if the education that has been created for Emile represents the education that Rousseau himself would have liked to have received.