Upon Isaiah's acceptance of the call to ministry, God assigns him to speak judgment to the people of Judah. This ministry was to go on until Jerusalem was laid waste by exile. God intends for them to keep on hearing and seeing but not understanding or perceiving. Somehow, he doesn't intend for them to get understanding and repent. Is this unfair? Perhaps not. In many ways, God expects his people to obey, even when they do not understand. The basis of faith is that God can be trusted and his word is trustworthy, even when we don't understand it, because he is trustworthy. When we do not obey God, we show our distrust of him, we think that either God is unreliable or God will not carry out his word. But God would not be slighted in this way. So if his people refused to obey him, he blocks their understanding as a way of punishment. In Romans 1, in respect of those who did not honour God despite knowing him, he "gave them over" to greater and greater depths of depravity, thereby blocking their ability to understand him.
Lord, I pray never to treat you or your word with contempt. Forgive my past sins and lead me in the way everlasting. Amen.