One section of our country believes slavery is RIGHT, and ought
to be extended, while the other believes it is WRONG, and ought
not to be extended. This is the only substantial dispute.
The fugitive-slave clause of the Constitution, and the law for the
suppression of the foreign slave-trade, are each as well enforced,
perhaps, as any law can ever be in a community where the moral
sense of the people imperfectly supports the law itself.
The great body of the people abide by the dry legal obligation
in both cases, and a few break over in each. This, I think,
cannot be perfectly cured; and it would be worse in both cases
AFTER the separation of the sections than BEFORE. The foreign
slave-trade, now imperfectly suppressed, would be ultimately revived,
without restriction, in one section, while fugitive slaves,
now only partially surrendered, would not be surrendered
at all by the other.

Physically speaking, we cannot separate. We cannot remove our
respective sections from each other, nor build an impassable wall
between them. A husband and wife may be divorced, and go out of
the presence and beyond the reach of each other; but the different
parts of our country cannot do this. They cannot but remain
face to face, and intercourse, either amicable or hostile,
must continue between them. Is it possible, then, to make
that intercourse more advantageous or more satisfactory after
separation than before? Can aliens make treaties easier than
friends can make laws? Can treaties be more faithfully enforced
between aliens than laws can among friends? Suppose you go to war,
you cannot fight always; and when, after much loss on both sides,
an no gain on either, you cease fighting, the identical old questions
as to terms of intercourse are again upon you.