Cross reference
Hebrews 5:11
11 Of whom we have many things to say, and hard of interpretation, seeing ye are become dull of hearing.
2 Peter 3:16
16 as also in all `his' epistles, speaking in them of these things; wherein are some things hard to be understood, which the ignorant and unstedfast wrest, as `they do' also the other scriptures, unto their own destruction.
Matthew 13:15
15 For this people's heart is waxed gross, And their ears are dull of hearing, And their eyes they have closed; Lest haply they should perceive with their eyes, And hear with their ears, And understand with their heart, And should turn again, And I should heal them.
Acts 28:27
27 For this people's heart is waxed gross, And their ears are dull of hearing, And their eyes they have closed; Lest, haply they should perceive with their eyes, And hear with their ears, And understand with their heart, And should turn again, And I should heal them.
John 16:12
12 I have yet many things to say unto you, but ye cannot bear them now.
John 6:6
6 And this he said to prove him: for he himself knew what he would do.
Luke 24:25
25 And he said unto them, O foolish men, and slow of heart to believe in all that the prophets have spoken!
Mark 8:21
21 And he said unto them, Do ye not yet understand?
Mark 8:17-18
17 And Jesus perceiving it saith unto them, Why reason ye, because ye have no bread? do ye not yet perceive, neither understand? have ye your heart hardened?
18 Having eyes, see ye not? and having ears, hear ye not? and do ye not remember?
Isaiah 6:10
10 Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they sea with their eyes, and hear with their ears, and understand with their heart, and turn again, and be healed.
1 Kings 10:1
1 And when the queen of Sheba heard of the fame of Solomon concerning the name of Jehovah, she came to prove him with hard questions.