Isaiah addresses Judah in a period when Jerusalem faced intense pressure from the Assyrian empire and constant debate about alliances, security, and survival (late eighth century BC). In that setting, leaders and the public could become overconfident, cynical about warnings, or reliant on plans that ignored prophetic counsel. Prophets and “seers” were expected to interpret events and call the nation to responsive action, but Isaiah depicts them as impaired and unable to do their role. The “sealed book” picture fits a society where literacy existed for some officials and scribes, while many others could not read at all.