Sourcing Bruce Lee

I saw a quote attributed to Bruce Lee on social media, and as soon as I read it I knew I was suspicious of its origin. "The key to immortality is first living a life worth remembering.” If you search for those words, you'll encounter a slew of people quoting it and saying Bruce Lee wrote it. Early in my research, I found a story which offered two helpful leads. First, it said that the quote appeared at the end of the mostly mythical 1993 "Dragon" Bruce Lee movie. Sure enough, here it is: Now we have the "sourcing" of this quote to Bruce Lee. I've also seen it attributed to Brandon Lee because of its use in the movie. Second, the article mentioned that this quote was attributed to St. Augustine. Using this new search parameter, I found plenty of other people quoted St. Augustine, an early father of the Catholic Church, as being the author, such as this person . However, I did searches of various repositories of St. Augustine's works...