House Divided Speech: Questions

Did Lincoln have good reason to believe that the U.S. would stop being divided over slavery in the near future? Given the context of the antebellum period, why might he believe it, or was it just political rhetoric?
Did the "house divided" cease to be divided after the Civil War and the Thirteenth Amendment?
What does the "House Divided" speech tell us about Lincoln's feelings towards slavery? Does it match what we know about him from the rest of his political career?
Do you think the Civil War proves Lincoln's claim in the "House Divided" speech right or wrong? Did the country "cease to be divided" or was the southern secession proof that the house didn't stand?
If Lincoln were giving the "House Divided" speech today, what do you think would be the issue he would focus on, now that slavery is gone? Why?