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.