we should read it, and not deny it:
Isaiah 6:6-10
Then one of the seraphim flew to me, having in his hand a live coal [which] he had taken with the tongs from the altar. And he touched my mouth [with it,] and said:
"Behold, this has touched your lips; your iniquity is taken away, and your sin purged."
Also I heard the voice of the Lord, saying:
"Whom shall I send, And who will go for Us?"
Then I said,
"Here [am] I! Send me."
And He said,
"Go, and tell this people:
'Keep on hearing, but do not understand; keep on seeing, but do not perceive.'
Make the heart of this people dull, and their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and return and be healed."
why does God say make their ears dull, but GWH says God would never say that?
why does God say shut their eyes, but GWH says God would never do that?
Jesus in Mark 4 and Matthew 13 is quoting Himself. yes, there is an element of sorrow here - who imagines God takes pleasure in the death of the wicked?
but there is not what someone chooses to call 'irony' - He is not saying something He does not mean. He is not instructing Isaiah to do the opposite of what He intends Isaiah to do. He is not lying.
He is telling Isaiah He will do exactly what He explained He did by teaching in parables: He will selectively make one eye blind, and one that sees. He will open the ear of one, and shut the ear of the other. to one He will reveal knowledge, and to another He will hide it.
the irony present is that those who said they see, did not, and those that said they do not hear, heard.
we may draw conclusions from this, but we cannot pretend it does not say what it says.
note the presence of the theme of salvation here: by the touching of the lips with the coal of the altar, Isaiah's sin was purged, and his iniquity removed from him. note this had nothing to do with any action the prophet took, but what was done to him by the seraphim.
this also cannot be removed from the passage.