What does Isaiah 19:3 mean?
Egypt will be subject to the Lord's judgment (Isaiah 19:1–2). When the foundations of a society become unstable, people lose hope and fall into despair. Isaiah describes this nation-wide depression in Egypt as the spirit of the Egyptians being emptied out. This is something like how a tree collapses when the trunk rots away. Or, how a sack deflates as it empties. Egyptian confidence and hope would wither, and their core foundations would crumble.Another part of the Lord's judgment against Egypt will be to demolish both their wisdom and their reputation. In other words, every suggestion about how to resolve the divisions among the people and the resulting chaos will be shown as worthless. Everyone will sense that no solutions are possible. They will be utterly stripped of their hope.
In response to this despair, the Egyptians will double down on their worship of idols. Surrounded by worthless human counselors, they will look for answers from sorcerers, mediums, and necromancers. They will once more place their hope in hearing from the spirits of the dead and the gods they serve. Just as He did during the exodus (Exodus 3:20), the God of Israel will once more show Himself to be far more powerful than the empty gods of the Egyptians.