John 10:6
This parable Jesus spoke to them; but they did not understand what the things were which he spoke to them.
Matthew 13:13-14
Therefore I speak to them in parables, because seeing they see not, and hearing they hear not, nor understand.
Matthew 13:51
Did ye understand all these things? They say to him, Yea.
John 6:52
The Jews therefore contended with one another, saying, How can this man give us his flesh to eat?
John 6:60
Many therefore of his disciples, when they heard this, said, This teaching is hard; who can listen to it?
John 7:36
What meaneth this which he said, Ye will seek me, and not find me; and where I am, ye cannot come?
John 8:27
They understood not that he spoke to them of the Father.
John 8:43
Why do ye not understand my language? It is because ye cannot listen to my word.
John 16:25
These things I have spoken to you in parables. The time is coming, when I shall no more speak to you in parables, but shall tell you plainly of the Father.
1 Corinthians 2:14
But the unspiritual man receiveth not the things of the Spirit of God; for they are foolishness to him, and he cannot know them; because they are spiritually discerned.
1 John 5:20
And we know that the Son of God hath come, and hath given us understanding, that we may know the True One; and we are in the True One, in his Son Jesus Christ. This is the true God, and everlasting life.