I saved a document in Pages and then made changes. I closed out because I didn't want to save the changes, but when I opened back up all the changes were there and I want to get the originally saved document back. How do I do this?
Choose File → Revert to → Browse all versions… from the menubar.
Choose the version you wish to restore and then press Restore.
Tip: If you don't want changes to your documents to be saved automatically, then enable the option Ask to keep changes when closing documents in the General section of System Preferences.