Hebrews 5:11
On this topic we have much to say and it is difficult to explain, since you have become sluggish in hearing.
2 Peter 3:16
speaking of these things in all his letters. Some things in these letters are hard to understand, things the ignorant and unstable twist to their own destruction, as they also do to the rest of the scriptures.
Matthew 13:15
For the heart of this people has become dull; they are hard of hearing, and they have shut their eyes, so that they would not see with their eyes and hear with their ears and understand with their hearts and turn, and I would heal them.'
Isaiah 6:10
Make the hearts of these people calloused; make their ears deaf and their eyes blind! Otherwise they might see with their eyes and hear with their ears, their hearts might understand and they might repent and be healed."
Mark 8:17-18
When he learned of this, Jesus said to them, "Why are you arguing about having no bread? Do you still not see or understand? Have your hearts been hardened?
Mark 8:21
Then he said to them, "Do you still not understand?"
Luke 24:25
So he said to them, "You foolish people -- how slow of heart to believe all that the prophets have spoken!
John 6:6
(Now Jesus said this to test him, for he knew what he was going to do.)
John 16:12
"I have many more things to say to you, but you cannot bear them now.
Acts 28:27
For the heart of this people has become dull, and their ears are hard of hearing, and they have closed their eyes, so that they would not see with their eyes and hear with their ears and understand with their heart and turn, and I would heal them."'
1 Kings 10:1
When the queen of Sheba heard about Solomon, she came to challenge him with difficult questions.