system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] What was the message that The Sentry left for Reed Richards in his diary?

Did we ever find out?
gpt
Wasn't it just a bunch of references to a hero that didn't exist, but yet did? He was able to manipulate a comic book being made of himself. He could quite possibly be the strongest telepath the world has ever seen. 

But to answer your question more directly, he asked to be put in the vault. That peaked Ricgards' interest.