Treasury of Scripture Knowledge
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.
So, the prophecy of Isaiah is being fulfilled by them, which says, [Isa. 6:9f] 'You will hear all right, but you will not understand [what you hear]. You will see all right but you will not perceive [what you see].
And He said to them, "You [disciples] are being given an understanding of the secrets of the kingdom of God, but the rest of the people [are being told] in parables, so that [even though they appear to be] seeing, they will not [actually] see; and [even though they seem to] hear, they will not understand.
But [even] though Jesus had performed so many [miraculous] signs in front of the people, still they did not believe in Him.
And when they could not agree among themselves they left, after hearing Paul make this one [important] statement: "The Holy Spirit has spoken truthfully to your forefathers through Isaiah the prophet,
as it has been written [Isa. 19:10], "God gave them a spirit of numbness [i.e., they developed a spiritual insensitivity to God and His word]. [He gave them] eyes to see with [but they would not look], and ears to hear with [but they did not listen]. And they still have this spirit."
Therefore, you people [must] repent [i.e., change your hearts and lives] and turn [back] again [to God] so that your sins will be blotted out and so that you may enjoy times of [spiritual] refreshment from the presence of the Lord [i.e., through the indwelling of the Holy Spirit].
2 Timothy 2:25
[He must] gently correct those people who oppose [him], in hope that God will give them [opportunity for] repentance, leading to a [full] knowledge of the truth,