Charles Spurgeon Commentary Nehemiah 4:7

"But it came to pass that, when Sanballat, and Tobiah, and the Arabians, and the Ammonites, and the Ashdodites, heard that the repairing of the walls of Jerusalem went forward, [and] that the breaches began to be stopped, then they were very wroth;" — Nehemiah 4:7 (ASV)

They were "angry" before; now they were "furious." If a work has no opposition from Satan, we may be half afraid it is good for nothing. If you cannot make the devil roar, you have not done him much harm; but the more he roars, the more cause there is for the angels to sing the praises of God before the throne.