And he said, Go, and tell this people, {o} Hear ye indeed, but understand not; and see ye indeed, but perceive not.

(o) By which is declared that for the malice of man God will not immediately take away his word, but he will cause it to be preached to their condemnation, when as they will not learn by it to obey his will, and be saved: by this he exhorts the ministers to do their duty, and answers to the wicked murmurers, that through their own malice their heart is hardened, Mt 13:14, Ac 28:26, Ro 11:8.

Wesley's Notes

6:9 Perceive not - The Hebrew words are imperative; yet they are not to be taken as a command what the people ought to do, but only as a prediction what they would do. The sense is, because you have so long heard my words, and seen my works, to no purpose, and have hardened your hearts, and will not learn nor reform, I will punish you in your own kind, your sin shall be your punishment. I will still continue my word and works to you, but will withdraw my Spirit, so that you shall be as unable, as now you are unwilling, to understand.

King James Translators' Notes

indeed, but understand: or, without ceasing, etc: Heb. in hearing, etc

Jamieson-Fausset-Brown Bible Commentary

9. Hear . indeed-Hebrew, "In hearing hear," that is, Though ye hear the prophet's warnings again and again, ye are doomed, because of your perverse will (Joh 7:17), not to understand. Light enough is given in revelation to guide those sincerely seeking to know, in order that they may do, God's will; darkness enough is left to confound the wilfully blind (Isa 43:8). So in Jesus' use of parables (Mt 13:14).

see . indeed-rather, "though ye see again and again," yet, &c.

Matthew Henry's Concise Commentary

6:9-13 God sends Isaiah to foretell the ruin of his people. Many hear the sound of God's word, but do not feel the power of it. God sometimes, in righteous judgment, gives men up to blindness of mind, because they will not receive the truth in the love of it. But no humble inquirer after Christ, need to fear this awful doom, which is a spiritual judgment on those who will still hold fast their sins. Let every one pray for the enlightening of the Holy Spirit, that he may perceive how precious are the Divine mercies, by which alone we are secured against this dreadful danger. Yet the Lord would preserve a remnant, like the tenth, holy to him. And blessed be God, he still preserves his church; however professors or visible churches may be lopped off as unfruitful, the holy seed will shoot forth, from whom all the numerous branches of righteousness shall arise.