2 Peter 3:16As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.
Matthew 13:15For this people's heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.
Isaiah 6:10Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed.
Mark 8:17-18And when Jesus knew it, he saith unto them, Why reason ye, because ye have no bread? perceive ye not yet, neither understand? have ye your heart yet hardened? Having eyes, see ye not? and having ears, hear ye not? and do ye not remember?
Mark 8:21And he said unto them, How is it that ye do not understand?
Luke 24:25Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken:
John 6:6And this he said to prove him: for he himself knew what he would do.
John 16:12I have yet many things to say unto you, but ye cannot bear them now.
Acts 28:27For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should be converted, and I should heal them.
1 Kings 10:1And when the queen of Sheba heard of the fame of Solomon concerning the name of the LORD, she came to prove him with hard questions.