Charles Spurgeon Commentary Isaiah 54:15-16

"Behold, they may gather together, but not by me: whosoever shall gather together against thee shall fall because of thee. Behold, I have created the smith that bloweth the fire of coals, and bringeth forth a weapon for his work; and I have created the waster to destroy." — Isaiah 54:15-16 (ASV)

Whoever shall gather together against you shall fall for your sake. Behold, I have created the smith that blows the coals in the fire,

For he cannot blow any more than God lets him. He is God's creature. The maker of the weapons of war is still in the hands of God.