In each of our lives, we will inevitably encounter moments that require us to make choices. If we can meet such a 'reverse guiding light', we have grasped the shortcut to decision-making: anything he firmly refuses to do is often worth pursuing; anything he passionately supports is likely at the end of a harvest, and you should not touch it at all. When you are torn about whether something is worth doing, just look at his attitude — the more actively he engages, the more decisively you should stay away; the more he resists and avoids, the more resolutely you should take action. This is the simplest judgment criterion.