Hebrews 5:11
We have many things to say about him and it is hard to explain it to you, for you are dull of hearing (slow to learn).
2 Peter 3:16
He spoke about these things in his letters. Some things are hard to understand. The untaught and unstable distort them as they do the other Scriptures, to their own destruction.
Matthew 13:15
The heart of this people is callous and dull. Their ears are plugged. They cannot hear. They closed their eyes and cannot see. They cannot see nor hear nor understand with their heart. They should turn around and I would heal them.'
Isaiah 6:10
This people's heart has become calloused. They hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts, and turn and be healed.(Septuagint)
Mark 8:17-18
Hearing this Jesus said: Why do you reason about having no bread? Do you not understand? Are your hearts dull of understanding?
Mark 8:21
He said: Do you not yet understand?
Luke 24:25
He said to them: You are foolish men. You are slow of heart to believe in all that the prophets have spoken!
John 6:6
He said this to test him for he knew what he would do.
John 16:12
I have yet many things to say to you, but you cannot endure them now.
Acts 28:27
These people have closed their mind and are hard of hearing. They have shut their eyes so that their eyes never see. Their ears never hear. Their minds never understand. They never turn to me for healing.'
1 Kings 10:1
The queen of Sheba heard of Solomon's fame. She traveled to Jerusalem to test him with difficult questions.