The Way Merlin's Mind Works
While on a camping trip, Merlin was obviously exhausted as he'd been acting strange all day. As he falls asleep, Gwaine finds a small leather bound journal hidden away in the servants coat, which he soon learns is a journal. He reads a few to himself, then to the Knights. They all soon realize how sad and how seemingly alone Merlin believes he is. They all realize, just how little they know about Merlin.
[Hint: The Knights and Arthur learn about Freya!]