Contradiction with Proverbs 28:5
While Isaiah 32:3 implies understanding for all, Proverbs 28:5 suggests the wicked do not understand justice.
Proverbs 28:5: Evil men understand not judgment: but they that seek the LORD understand all [things].
Contradiction with Matthew 13:13
Isaiah 32:3 speaks of clear perception, whereas Matthew 13:13 explains that speaking in parables is to prevent understanding.
Matthew 13:13: Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand.
Contradiction with John 12:40
In contrast to Isaiah 32:3's clarity, John 12:40 suggests God blinds and hardens some to prevent understanding.
John 12:40: He hath blinded their eyes, and hardened their heart; that they should not see with [their] eyes, nor understand with [their] heart, and be converted, and I should heal them.
Contradiction with Acts 28:26-27
Isaiah 32:3 indicates comprehension, while Acts 28:26-27 speaks of hearts being hardened to lack understanding.
Acts 28:26-27: Saying, Go unto this people, and say, Hearing ye shall hear, and shall not understand; and seeing ye shall see, and not perceive: