Beware of confusing God’s apparent slowness to anger with any weakness or ambivalence. He will bring judgment sure and final in His time. 
The Lord is a jealous and avenging God; the Lord is avenging and wrathful; the Lord takes vengeance on his adversaries and keeps wrath for his enemies. The Lord is slow to anger and great in power, and the Lord will by no means clear the guilty. His way is in whirlwind and storm, and the clouds are the dust of his feet. Nahum 1:2, 3
Also [the beast] was allowed to make war on the saints and to conquer them. And authority was given it over every tribe and people and language and nation, and all who dwell on earth will worship it, everyone whose name has not been written before the foundation of the world in the book of life of the Lamb who was slain. Revelation 13:7-8
The Bible from start to finish shows us that God is firmly in control of human history. Nothing escapes His knowledge, His presence, or His power. That does not mean that He watches human history as a disinterested bystander. He will act in His time to reward faithfulness and punish evil.
In Nahum’s day, the nation of Assyria was imposing her power on the surrounding nations. Israel had already fallen to her and Judah, under King Manasseh, was a vassal state. Nahum proclaimed the power of God in the midst of this difficult situation. Assyria would fall, he assured them. God is slow to anger but not weak in power. He would pour out His wrath. Meanwhile, Nahum, whose name means comfort, reminded Judah that “The Lord is good, a stronghold in the day of trouble; he knows those who take refuge in him” (1:7).
John sees two beasts, one from the sea and one from the earth. These united with the dragon wreak havoc on God’s people, who do not take the mark of the beast which gives access to commerce. It seems like a hopeless situation, yet God limits the time allotted to these beasts. God reassures all who refuse to worship the beast–their names were recorded before time in the Lamb’s book of life.
Think about it
Let this bring comfort to us who believe but warning to all who confuse God’s patience with any kind of weakness. His judgment will come in His time, not ours.
 The Reformation Study Bible, introductory notes to Nahum, p. 1587