'Itself' in the Bible

Therefore do not be anxious for tomorrow, because tomorrow will be anxious for itself. {Each day has enough trouble of its own.}

But knowing their thoughts, he said to them, "Every kingdom divided against itself is laid waste, and every city or household divided against itself will not stand.

Then it goes and brings along with itself seven other spirits more evil than itself, and [they] go in [and] live there. And the last [state] of that person becomes worse than the first. So it will be for this evil generation also!"