John 8:27

They knew not that of the Father he spake to them;

Isaiah 6:9

And He saith, 'Go, and thou hast said to this people, Hear ye -- to hear, and ye do not understand, And see ye -- to see, and ye do not know.

Isaiah 42:18-20

Ye deaf, hear; and ye blind, look to see.

Isaiah 59:10

We feel like the blind for the wall, Yea, as without eyes we feel, We have stumbled at noon as at twilight, In desolate places as the dead.

John 8:43

wherefore do ye not know my speech? because ye are not able to hear my word.

John 8:47

he who is of God, the sayings of God he doth hear; because of this ye do not hear, because of God ye are not.'

Romans 11:7-10

What then? What Israel doth seek after, this it did not obtain, and the chosen did obtain, and the rest were hardened,

2 Corinthians 4:3-4

and if also our good news is vailed, in those perishing it is vailed,

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

John 8:43
wherefore do ye not know my speech? because ye are not able to hear my word.
Isaiah 6:9
And He saith, 'Go, and thou hast said to this people, Hear ye -- to hear, and ye do not understand, And see ye -- to see, and ye do not know.
Isaiah 42:18
Ye deaf, hear; and ye blind, look to see.
Isaiah 59:10
We feel like the blind for the wall, Yea, as without eyes we feel, We have stumbled at noon as at twilight, In desolate places as the dead.
Romans 11:7
What then? What Israel doth seek after, this it did not obtain, and the chosen did obtain, and the rest were hardened,
2 Corinthians 4:3
and if also our good news is vailed, in those perishing it is vailed,