John 10:6
This parable spoke Jesus to them; but they knew not the meaning of the things which he spoke to them.
Matthew 13:13-14
For this reason I speak to them in parables; because when they see, they see not; and when they hear, they hear not, nor do they understand.
Matthew 13:51
Jesus said to them: Have you understood all these things? They said to him: Yes, Lord.
John 6:52
The Jews, therefore, contended among themselves, saying: How can this man give us his flesh to eat?
John 6:60
Therefore, many of his disciples, when they heard him, said: This is a hard saying; who can hear it?
John 7:36
What means this saying which he uttered, You will seek me, and will not find me; and, Where I am you can not come?
John 8:27
They knew not that he was speaking to them of the Father.
John 8:43
Why do you not know what I say? Because you can not understand my words.
John 16:25
These things I have spoken to you in parables; the time is coming when I will no longer speak to you in parables, but will teach you plainly concerning the Father.
1 Corinthians 2:14
But an animal man receives not the things of the Spirit of God, for they are foolishness to him, and he can not know them, because they are spiritually discerned.
1 John 5:20
And we know that the Son of God has come, and has given us understanding, that we may know him that is true: and we are in him that is true, in his Son Jesus Christ. This is the true God, and life eternal. Little children, keep yourselves from idols.