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Use the excerpt below to answer the question."But this momentous question, like a fire bell in the night, awakened and filled me with terror. I considered it at once as the knell of the Union. It is hushed, indeed, for the moment. But this is a reprieve only, not a final sentence. A geographical line, coinciding with a marked principle, moral and political, once conceived and held up to the angry passions of men, will never be obliterated; and every new irritation will mark it deeper and deeper. . . . The cession of that kind of property, for so it is misnamed, is a bagatelle which would not cost me a second thought, if, in that way, a general emancipation and expatriation could be effected; . . . But as it is, we have the wolf by the ears, and we can neither hold him, nor safely let him go. Justice is in one scale, and self-preservation in the other. . . . [Congress should not] regulate the condition of the different descriptions of men composing a State. This certainly is the exclusive right of every State, which nothing in the constitution has taken from them and given to the General Government." - Thomas Jefferson to John Holmes, Monticello, April 22, 1820>What does Jefferson emphasize in his message?

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