Arguably the most famous martial artist who ever lived, as well as founder of the hybrid martial arts philosophy Jeet Kune Do, Bruce Lee was also an actor in such classic movies as “Fist of Fury” and “Enter the Dragon.” Lee’s philosophical leanings and his distinctive way with words have made him eminently quotable. The observation above appears in his dedication to “the free, creative martial artist” at the start of his 1975 book “Tao of Jeet Kune Do.” Lee’s philosophy, which encourages a process of selective learning, adaptation, and personalization, can be applied to countless other pursuits beyond martial arts, from business to art to daily life.