Of course the lessons back in TLJ was to disuade Rey from training as a Jedi, or “prove” the Jedi were wrong, but it would be a fun “twist” he plays on the lack of the third lesson (since Rey left) from the last movie and “converts it” to an actual “Jedi good/right” lesson.
Kinda would be a fun play on the whole lessons thing from the last movie.
This is what I was thinking jarbear. This totally would NOT have been the third lesson he gave her on the island if she hadn’t left, but rather it is him sort of making fun of his previous self. He is correcting what his lessons should have been about basically.