The full transcript for Supernatural season 13, episode 4, "The Big Empty," features the brothers and Jack investigating a case, alongside Castiel’s encounter with a cosmic entity. The episode focuses on grief-induced hauntings and Castiel’s awakening in a void.
You can find the complete script on the Super-wiki 13.04 Transcript page , with key quotes also available on IMDb's Quotes page . 13.04 The Big Empty (transcript) - Super-wiki