John 8:43

If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.

I am come in my Father’s name, and ye receive me not: if another shall come in his own name, him ye will receive.

Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.

Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?

Evil men understand not judgment: but they that seek the LORD understand all things.

To whom shall I speak, and give warning, that they may hear? behold, their ear is uncircumcised, and they cannot hearken: behold, the word of the LORD is unto them a reproach; they have no delight in ...

They understood not that he spake to them of the Father.

And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not.

They have not known nor understood: for he hath shut their eyes, that they cannot see; and their hearts, that they cannot understand.

Who is wise, and he shall understand these things? prudent, and he shall know them? for the ways of the LORD are right, and the just shall walk in them: but the transgressors shall fall therein.

But they know not the thoughts of the LORD, neither understand they his counsel: for he shall gather them as the sheaves into the floor.

There is none that understandeth, there is none that seeketh after God.