A house divided against itself cannot stand. Watch
I would interpret it much in the same way as lincoln intended, that political division will lead to either eventual destruction or the victory of one side over the other, and being left in a state of balance between the two cannot last.
However, you could equally argue that dissent on opinion is ultimately bad for a particular group. Unity and like-mindedness are the only saviors of a broken system, and thus the weakened links must be weeded out.