Why was further instruction concerning this vision necessary ?

Answer

"And I Daniel fainted, and was sick certain days; afterward I rose up, and did the king's business; and I was
astonished at the vision, but none understood it." Verse 27.

In what work are angels engaged?
Why are its gates not to be closed?
What assurance is given concerning the unfailing power of the Creator?
How long will they reign?
18. Answering the question as to what would be the sign of His coming and the end of the world, what did Christ say?
In all we do, whose glory should we have in view?
How, according to Luke, did Christ answer this question?

Questions & Answers are from the book Bible Readings for the Home Circle