Charles Spurgeon Commentary Isaiah 27:4

"Wrath is not in me: would that the briers and thorns were against me in battle! I would march upon them, I would burn them together." — Isaiah 27:4 (ASV)

Men who are at enmity with God little know how terrifying the force of His strength is. They are like dry thorns when the fire catches them, and nothing burns more readily. The bush on the common, when some wild youth sets fire to it, suddenly blazes up, crackles, and is gone; so will it be with the ungodly. God has only to go through them, and they will be destroyed. But now comes a message of mercy.