John 10:6
This parable spoke Jesus to them, but they knew not what the words which he spoke to them meant.
Matthew 13:13-14
For this reason I speak to them in parables; because seeing they do not see, and hearing they do not hear, nor understand.
Matthew 13:51
Have you understood all these thing? They said to him, Yes, Lord.
John 6:52
Then the Jews contended one with another, saying, How can this man give us his flesh to eat?
John 6:60
Then many of his disciples hearing him said, This is a hard saying; who can hear him?
John 7:36
What does the word which he said mean; You shall seek and shall not find me, and where I am you cannot come?
John 8:27
They understood not that he spoke to them of the Father.
John 8:43
Why do you not understand my speech? because you cannot hear my word.
John 16:25
These things have I spoken to you in parables. The time is coming when I will no more speak to you in parables, but I will tell you plainly of the Father.
1 Corinthians 2:14
But the natural man receives not the [things] of the Spirit of God, for they are foolishness to him, and he cannot know them, for 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 the true One; and we are in the true One, in his Son Jesus Christ; this is the true God, and eternal life.