Jezebel had a point but oddly enough, Eren had never thought of himself as a ghost. Just as dead. He knew it would be a helpless attempt to explain his thoughts but he tried.

"I always imaged ghosts the way they are in fairy tales. You know translucent, floating through the air and all this stuff."
He made a short pause before he added "What if ghosts here are something different, like we image them?"

That explanation was making sense. Eren had no idea how many sins he had committed. Not was he aware of the sin of his fellow citizens. The fact, that they were all sinners had connected them from the beginning and therefore it was hard for Eren to judge someone else. And if he was honest to himself, he didn't want to know all the sins from the people he was starting to call "acquaintances" or "friends".

"In my past life I've heard, that there are some sins that can never be redeemed."