All 3 Uses

revelation
in
Change of Heart, by Picoult
(Auto-generated)

In Revelations, we're told of a beast that uses miracles to fool men into worshipping it.†
*
This isn't about some revelation; it's not about who Shay might have been or might be in the future.

revelation = something previously unknown; or making such a thing known
During a ....confession, Shay Bourne made some revelations that indicate there are details of his case that weren't revealed at the time—that the deaths occurred accidentally while Mr. Bourne was in fact trying to protect Elizabeth Nealon from her father's sexual abuse.†

Definitions:

(1) (revelation)
something that was previously unknown (and typically surprising); or making such a thing known
(2) (meaning too rare to warrant focus)
As a proper noun, Revelation refers to the last book of the Bible with visionary descriptions of the End of Days. It can also refer to things revealed religiously rather than via logic.