It’s about how the past has everything to teach us. Specifically, failure. It’s not about discarding the past, Yoda talks about growing “beyond” [it]. That’s the quote. Rey is going to make different choices than Luke, and Luke is not going to let those past choices define his identity. Rey is not going to define herself by her past as an unwanted nobody.
Eh… people always say this, and I think “oh yeah… I guess that makes sense.”
Then later I actually rewatch the movie.
And I see Yoda burn down an ancient library probably filled with priceless artifacts and ancient wisdom while giggling (Yoda isn’t supposed to giggle when not in incognito-mode but whatever). And I see that Rey learns almost nothing from Luke, except maybe one thing in a deleted scene and a basic explanation of what the Force is. Rey swings around a lightsaber by herself because Luke can’t be bothered to teach her some moves. When Rey looks in a mirror she sees nothing but an infinitely recursive reflection of herself. Then Rey leaves, having learned almost nothing, but Yoda assures us she has all she needs.
The overall message conveyed is that the past is almost exclusively something we must move beyond from - not learn from, except, I will grant, inasmuch as the past teaches us what not to do (learning from failures). At the end of the movie, Rey triumphantly lifts some boulders using the Force, calling back to an earlier meta-joke about “lifting rocks”. But where did Rey even learn to do this? She didn’t learn this from absorbing any wisdom of the past. Nobody taught her. Presumably, she looked inward and taught herself, I guess. Even in terms of learning strictly from past failures, there is little Rey absorbs from the past failures of the Jedi or Luke that plays out meaningfully plot-wise.