How may one know that this does not refer to the earthly sanctuary ?

Answer

"He said unto me, Understand, 0 son of man: for at the time of the end shall be the vision." Verse 17.
NOTE - The prophetic period Of 2300, days (years) extends to AD. 1844, while the divinely appointed
services of the earthly sanctuary ceased at the cross (Dan. 9:27; Matt. 27:50,51), and the sanctuary itself
was destroyed in AD. 70, when Titus captured Jerusalem. For explanation of the period here mentioned,
see the preceding reading.

Through what was the original creation wrought?
Who is the Comforter, and what was He to do?
How is the remnant church described?
How does this association regard the Catholic Church on this point?
What change will then take place in both the living and the sleeping saints?
What should one do if asked to inquire of a familiar spirit ?
What instruction does the Apostle John give touching this subject?

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