Hebrews 5:11
Of whom we have much to say which it is hard to make clear, because you are slow of hearing.
2 Peter 3:16
And as he said in all his letters, which had to do with these things; in which are some hard sayings, so that, like the rest of the holy Writings, they are twisted by those who are uncertain and without knowledge, to the destruction of their souls.
Matthew 13:15
For the heart of this people has become fat and their ears are slow in hearing and their eyes are shut; for fear that they might see with their eyes and give hearing with their ears and become wise in their hearts and be turned again to me, so that I might make them well.
Isaiah 6:10
Make the hearts of this people fat, and let their ears be stopped, and their eyes shut; for fear that they may see with their eyes, and be hearing with their ears, and their heart may become wise, and they may be turned to me and made well.
Mark 8:17-18
And Jesus, hearing it, said to them, Why are you reasoning among yourselves because you have no bread? do you still not see, and is it still not clear to you? are your hearts so hard?
Mark 8:21
And he said to them, Is it still not clear to you?
Luke 24:25
And he said, O foolish men! how slow you are to give belief to what the prophets have said.
John 6:6
This he said, testing him: for he had no doubt what he himself would do.
John 16:12
I have still much to say to you, but you are not strong enough for it now.
Acts 28:27
For the heart of this people has become fat and their ears are slow in hearing and their eyes are shut; for fear that they might see with their eyes and give hearing with their ears and become wise in their hearts and be turned again to me, so that I might make them well.
1 Kings 10:1
Now the queen of Sheba, hearing great things of Solomon, came to put his wisdom to the test with hard questions.