John 10:6

Yea, they are greedy dogs which can never have enough, and they are shepherds that cannot understand: they all look to their own way, every one for his gain, from his quarter.

Evil men understand not judgment: but they that seek the Lord understand all things.

They know not, neither will they understand; they walk on in darkness: all the foundations of the earth are out of course.

Many shall be purified, and made white, and tried; but the wicked shall do wickedly: and none of the wicked shall understand; but the wise shall understand.

And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not. Make 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.

These things have I spoken unto you in proverbs: but the time cometh, when I shall no more speak unto you in proverbs, but I shall shew you plainly of the Father.

Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand. And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:

Jesus saith unto them, Have ye understood all these things? They say unto him, Yea, Lord.

Our fathers understood not thy wonders in Egypt; they remembered not the multitude of thy mercies; but provoked him at the sea, even at the Red sea.

But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.

And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.

The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?

Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?

What manner of saying is this that he said, Ye shall seek me, and shall not find me: and where I am, thither ye cannot come?

They understood not that he spake to them of the Father.

Why do ye not understand my speech? even because ye cannot hear my word.