behind the veil —(also: beyond the veil) is used with reference to the next world:
- He [Christ] described the world behind the veil with the graphic force of one to whom it was no unknown country.
Note: The expression does not correlate in meaning with the phrase behind the scenes—out of public view; in secret:
- We could only assess what we could observe but here the main part of the work is carried out behind the scenes.
under the veil—is used with reference to smth. which conceals or obscures a person’s true motives:
- Some terror acts are organized under the veil of religion in an attempt to justify such conduct.