Bruce Lee believed “strength is an illusion” because true power doesn’t come from rigid force or muscle, but from flexibility, calmness, and the ability to flow like water. He realized that clinging to strength makes you stiff, predictable, and vulnerable, while letting go of ego and tension allows effortless, adaptable power to emerge. Strength rooted in fear collapses under pressure, but real power comes from mastering yourself, staying relaxed, and moving with, not against, challenges.