I love Yoda and what he says here gives even more context as to why Luke knows he can't save Ben himself is because he no longer knows how to reach him because Ben became a harsher more difficult problem for him than Vader who he had an actual reliable connection help him up through and walk away from the fall.

"We Are What They Grow Beyond!" is yes kids taught well grow up to be more of a better person than their parents or relatives who came before them, absolutely true. But it is also saying what Solutions in the past that may have solved a problem for the elders may not also work for the younger generation, Skylights because the Problem has grown beyond its previous solutions. It is actually and also exactly basically saying what Aslan says in The Chronicles of Narnia. "The Same Things Don't Happen Twice."