Iron appears to melt and its dross is consumed. When new forms are made, it returns to its original state.

This insightful couplet uses the example of iron smelting. When iron melts, impurities, like slag, seem to separate and disappear. But when it's time to actually shape the iron into something useful, those impurities often reappear, making the task difficult. It teaches us a profound lesson about life. Sometimes, problems or negative influences seem to vanish during easy times. However, when we face a real challenge, or when we're trying to achieve something significant, those underlying issues often resurface, testing our resolve. It's a reminder that true purity and strength are proven not just when things melt down, but when we successfully shape our destiny despite recurring obstacles.