Why do many people know what to do but still can't do it? This isn't because of a lack of self-discipline or willpower, but because "knowing" and "doing" fundamentally belong to two different systems: the former is cognitive understanding used to interpret the world; the latter is a behavior system driven by real-world pathways and structures. People often mistakenly believe that once they understand the principles, their actions will automatically change. In reality, most behaviors occur along existing low-cost pathways automatically and are continuously influenced by short-term feedback and environmental reinforcement, even forming inertia. Therefore, even if someone knows what is better, as long as the structure remains unchanged, their behavior will stay on the old track. True change doesn't rely on stronger willpower but on reconstructing behavioral pathways: by adjusting the environment and changing costs and feedback, making new behaviors easier to adopt. Once the pathway is redesigned, actions naturally change, and "doing" is no longer a struggle but becomes the system's new default state.