Which sentence in this excerpt from "Reconstruction" by Frederick Douglass best expresses the central idea?

Seldom has any legislative body been the subject of a solicitude more intense, or of aspirations more sincere and ardent.
Questions of vast moment, left undecided by the last session of Congress, must be manfully grappled with by this.
The last session really did nothing which can be considered final as to these questions.
While there remains such an idea as the right of each State to control its own local affairs,—an idea, by the way, more deeply rooted in the minds of men of all sections of the country than perhaps any one other political idea,—no general assertion of human rights can be of any practical value.
All that is necessary to be done is to make the government consistent with itself, and render the rights of the States compatible with the sacred rights of human nature.