Luke 18:34

But they understood none of these sayings. His words were a mystery to them, and they did not know what he meant.

John 12:16

His disciples did not understand these things at first; but when Jesus had been glorified, then they remembered that these things had been written concerning him, and what they had done to him.

Acts 1:7

He answered. "It is not for you to know times and occasions which the Father has fixed in his own authority;

1 Peter 1:11

They were searching to know to what time, or to what manner of time the Spirit of Christ which was in them kept pointing, when he ever testified beforehand concerning the sufferings of Christ and the glories that would follow.

Treasury of Scripture Knowledge

Summary

And I heard, but I understood not: then said I, O my Lord, what shall be the end of these things?

General references

Bible References

But

Luke 18:34
But they understood none of these sayings. His words were a mystery to them, and they did not know what he meant.
John 12:16
His disciples did not understand these things at first; but when Jesus had been glorified, then they remembered that these things had been written concerning him, and what they had done to him.
Acts 1:7
He answered. "It is not for you to know times and occasions which the Father has fixed in his own authority;
1 Peter 1:11
They were searching to know to what time, or to what manner of time the Spirit of Christ which was in them kept pointing, when he ever testified beforehand concerning the sufferings of Christ and the glories that would follow.

General references

Mark 13:4
"Tell us when these things shall be, and what shall be the sign that all these predictions are about to be fulfilled."