Mitch addresses this afterword to us, ten years after he's written Tuesdays with Morrie.
He tells us the story of when he actually called Morrie up that first time. He formally addressed Morrie, asking if he remembered him.
Morrie's response is "How come you didn't call me Coach?" (28.6). Typical Morrie.
Mitch then gives us a brief recap of the journey that happened, including the process of his writing the book.
He boils it down to that phone call—how he assumed that Morrie would have forgotten him, and how Morrie actually remembered.
In going over the old tapes and notes, Mitch came across a topic that wasn't really discussed in Tuesdays with Morrie: life after death.
Morrie had always been an agnostic, but as he started to die he started learning about all different kinds of religious beliefs.
When Mitch had posed the question to him, Morrie hadn't decided what he thought completely, though he admitted that life was just too wonderful to be an accident.
Now that Morrie is gone, Mitch misses all the goodness that came from being around him: the positive outlook, the laughing, the twinkle in his eye. Morrie was such a genuinely happy person that he changed the people around him.
Mitch admits that he only wrote the book to help Morrie pay his bills; he is overwhelmed by how popular the book became.
He offers his gratitude for everything that's happened since his Tuesdays with Morrie.