Three souls

Soul A is sitting at He's desk. Soul B is lying over He's bed. He is standing on the floor, looking for a soul, crying desperately. He thinks that he should not have done a lot of things he has done. He thinks that he should have done a lot of things he has not done, and probably never will. Then He finds out that he is standing in front two souls.
Soul A understands, as an example, how He thinks about the books he has not read. Soul B laughs, as an example, at the books He has read. He stops crying, then he tries to talk to Soul A, which instantly vanishes. He smiles at Soul B, which instantly stops laughing.
As Soul B starts laughing again, Soul A appears; it is now talking about the things He should do instead of not doing anything. As an example, Soul B laughs. He does not know whether to laugh, talk, or listen, as he wishes not to lose sight of Soul A again. He laughs. Soul B vanishes.
He thinks he should not laugh nor talk. As an example, Soul A tells a joke to make Soul B laugh; they are both reading He's thought. He thinks of the difference between reading a mind and reading a thought. This leads to an awkward silence—he thinks that the mind is made of thoughts.
Surprisingly, Soul B starts talking with a serious voice. He listens. Surprisingly, Soul A starts thinking. He reads. Soul A and Soul B look at him, amazed. He just laughs, then he vanishes. Soul C appears. Soul C then thinks about the things He wants it to think about. As an example, Soul C talks, listens, reads, laughs, and, surprisingly, stops vanishing.
He wakes up alone in his room. "Off we go," he finally says. "We don't mind about their thoughts, we'll start writing."