New Revised Standard Version
in order that ‘they may indeed look, but not perceive, and may indeed listen, but not understand; so that they may not turn again and be forgiven.’”

Contemporary English Version
The reason is, "These people will look and look, but never see. They will listen and listen, but never understand. If they did, they would turn to God and be forgiven."

New American Bible
so that ‘they may look and see but not perceive, and hear and listen but not understand, in order that they may not be converted and be forgiven.’ ”

Douay-Rheims Bible
That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.

That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.

That seeing.

Deuteronomy 29:4 And the Lord hath not given you a heart to understand, and eyes to see, and ears that may hear, unto this present day.

Isaiah 6:9,10 And he said: Go, and thou shalt say to this people: Hearing, hear, and understand not: and see the vision, and know it not. . . .

Isaiah 44:18 They have not known, nor understood: for their eyes are covered that they may not see, and that they may not understand with their heart.

Jeremiah 5:21 Hear, O foolish people, and without understanding: who have eyes, and see not: and ears, and hear not.

Matthew 13:14,15 And the prophecy of Isaias is fulfilled in them, who saith: By hearing you shall hear, and shall not understand: and seeing you shall see, and shall not perceive. . . .

Luke 8:10 To whom he said: To you it is given to know the mystery of the kingdom of God; but to the rest in parables, that seeing they may not see and hearing may not understand.

John 12:37-41 And whereas he had done so many miracles before them, they believed not in him: . . .

Acts 28:25-27 And when they agreed not among themselves, they departed, Paul speaking this one word: Well did the Holy Ghost speak to our fathers by Isaias the prophet, . . .

Romans 11:8-10 As it is written: God hath given them the spirit of insensibility; eyes that they should not see and ears that they should not hear, until this present day. . . .

be converted.

Jeremiah 31:18-20 Hearing I heard Ephraim when he went into captivity: thou hast chastised me, and I was instructed, as a young bullock unaccustomed to the yoke. Convert me, and I shall be converted, for thou art the Lord my God. . . .

Ezekiel 18:27-32 And when the wicked turneth himself away from his wickedness, which he hath wrought, and doeth judgment, and justice: he shall save his soul alive. . . .

Acts 3:19 Be penitent, therefore, and be converted, that your sins may be blotted out.

2 Timothy 2:25 With modesty admonishing them that resist the truth: if peradventure God may give them repentance to know the truth;

Hebrews 6:6 And are fallen away: to be renewed again to penance, crucifying again to themselves the Son of God and making him a mockery.