Nahum
God sent Nahum to predict doom for the Assyrians. Doom for the Assyrians is good news for all those who have been oppressed by them. Thus this is bad news for all nations who would oppose God, and good news for those who trust and submit to him.
Habakkuk
This prophet had two questions. First, he asked God how he could allow the evil people in Judah to get away with their crimes. God answered that he would punish them by bringing Babylon to conquer them. That raised a second and even more difficult question in Habakkuk’s mind: how could God use an even more wicked people to judge Judah? God doesn’t give a direct answer to this question. The bottom line though is that we must trust God because even when we don’t understand, we know he always does the things that are best for him and for us.