John 8:27

They did not understand that he meant the Father.

John 8:43

How is it that you do not understand what I say? It is because you cannot bear to listen to my Message.

John 8:47

He who comes from God listens to God's teaching; the reason why you do not listen is because you do not come from God."

Romans 11:7-10

What follows from this? Why, that Israel as a nation failed to secure what it was seeking, while those whom God selected did secure it.

2 Corinthians 4:3-4

And, even if the Good News that we bring is veiled, it is veiled only in the case of those who are on the path to Ruin--

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

John 8:43
How is it that you do not understand what I say? It is because you cannot bear to listen to my Message.
Romans 11:7
What follows from this? Why, that Israel as a nation failed to secure what it was seeking, while those whom God selected did secure it.
2 Corinthians 4:3
And, even if the Good News that we bring is veiled, it is veiled only in the case of those who are on the path to Ruin--