Isaiah 6's commissioning does not mean God does not want Israel healed — the prophet's message hardens already-rejecting hearts, and God's overall posture throughout Isaiah is restorative.

Winger walks through Isaiah 6: Isaiah's vision, the seraph with the coal touching his lips — which Winger reads typologically as a picture of Christ's atoning blood from the heavenly altar (since altars are for sacrifice, sacrificial blood fell on coals, and Christ offered himself in heaven per Heb 9). He argues the command to 'make the heart of this people dull' describes the effect of Isaiah's preaching on already-rejecting hearts — the message hardened them further. God's actual desire throughout Isaiah is restoration (Isa 1:18: 'Come let us reason together, though your sins are as scarlet they shall be white as snow'). The passage is also quoted by Jesus in the NT; Winger references his Romans series on why God hardens hearts.