Introduction
One verse after the eager 'Here am I; send me' (v. 8), God hands Isaiah a brutal assignment: preach to a people who will not listen. Verse 9 sobers v. 8's enthusiasm — God's call is sometimes to faithfulness without visible fruit.
Historical Context
Isaiah ministered through Judah's spiritual decline under Ahaz and Hezekiah. Verse 9 (with v. 10) predicts the hardening that would precede Babylonian exile. Jesus quoted these words to explain unbelief in His own day (Matt 13:14-15).
Original Language Insights
'Hear ye indeed' (shimu shamo'a) — Hebrew infinitive absolute, emphatic: keep on hearing without understanding. A divinely permitted dulling that confirms a heart already set against truth.
Theological Significance
Sometimes preaching produces hardening, not softening. God's call is to faithful proclamation; results belong to Him. Verse 9 is a warning to messengers tempted to measure ministry by response, and a comfort to those preaching where ears are closed.
Practical Application
If you serve God in a hard field — workplace, family, neighbourhood — v. 9 reframes apparent failure. Your job is to go and tell, as Isaiah did. The hardening or softening of hearts is God's prerogative.