Bruce Lee understood something that mere modesty cannot teach: the person who must constantly demonstrate their worth has already admitted its absence. True mastery—whether in martial arts, writing, or any craft—proves itself through economy and effect, not volume and noise. You notice this in the exceptional surgeon who doesn't need to tell you about her credentials, or the genuinely confident friend who listens more than he speaks. What makes Lee's observation cut deeper than simple advice against bragging is that he identifies the *psychological root*: the showoff has mistaken visibility for value, and in doing so, reveals a fundamental doubt about the real thing.