The Book of Daniel was a volume of the Bible, once quoted by Ianto Jones. Verse ten of its twelfth chapter went:
- "And I heard but did not understand and I said, 'Master, what is the end of all these things?'
- And he said, 'Go, Daniel, for the things are closed up and sealed until the end of time.'"
Gwen Cooper found this "a bit close for comfort" to the situation they were at the time facing following Owen Harper's widening of the Cardiff Space-Time Rift. (TV: End of Days)