John 8:43

Why do you not know what I say? Because you can not understand my words.

John 7:17

If any one will do his will, he shall know with respect to the teaching, whether it is of God, or I speak of myself.

John 5:43

I have come in my Father's name, and you receive me not; if another should come in his own name, him you would receive.

John 6:60

Therefore, many of his disciples, when they heard him, said: This is a hard saying; who can hear it?

John 8:27

They knew not that he was speaking to them of the Father.

John 12:39-40

For this reason they could not believe, because Isaiah said again:

Acts 7:51

You stiff-necked, and uncircumcised in heart and in ears, you do always resist the Holy Spirit; as your fathers did, so also do you.

Romans 3:11

there is none that understands; there is none that seeks after God;

Romans 8:7-8

Because the mind of the flesh is enmity against God; for it is not subject to the law of God, nor indeed can it be.

Treasury of Scripture Knowledge

Summary

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

Bible References

Do

John 8:27
They knew not that he was speaking to them of the Father.
John 5:43
I have come in my Father's name, and you receive me not; if another should come in his own name, him you would receive.
John 7:17
If any one will do his will, he shall know with respect to the teaching, whether it is of God, or I speak of myself.
John 12:39
For this reason they could not believe, because Isaiah said again:
Romans 3:11
there is none that understands; there is none that seeks after God;

Ye cannot

John 6:60
Therefore, many of his disciples, when they heard him, said: This is a hard saying; who can hear it?
Acts 7:51
You stiff-necked, and uncircumcised in heart and in ears, you do always resist the Holy Spirit; as your fathers did, so also do you.
Romans 8:7
Because the mind of the flesh is enmity against God; for it is not subject to the law of God, nor indeed can it be.

General references

Matthew 16:11
How is it that you do not understand, that I did not speak of bread when I commanded you to beware of the leaven of the Pharisees and of the Sadducees?
Matthew 25:42
For I was hungry, and you gave me no food; I was thirsty, and you gave me no drink;
John 7:17
If any one will do his will, he shall know with respect to the teaching, whether it is of God, or I speak of myself.
John 8:27
They knew not that he was speaking to them of the Father.
John 16:9
Of sin, because they believe not on me;