This is the thesis of the entire movie. Daniel is trying to force his life (and his new relationship with Kumiko) to go a certain way. But Miyagi teaches him that you can't force nature. You have to have a strong foundation (strong roots), and then let life happen.
The genius of the sequel is that it doesn’t try to remake the first movie. There’s no "All-Valley Tournament" rematch. Instead, Mr. Miyagi decides to go home to Okinawa to visit his dying father, and Daniel—being the loyal student he is—tags along. Karate Kid- parte 2
Daniel, ever the loyal student, joins Miyagi on the trip. This shift in setting allows the film to explore Miyagi’s backstory, transforming him from a mysterious mentor into a fully realized man with his own vulnerabilities and regrets. The Conflict: Honor vs. Revenge This is the thesis of the entire movie