A rushing river winding down a mountain valley came face to face with a massive, stubborn granite boulder blocking its path forward. The proud boulder laughed mockingly: 'You are so soft and fluid! Try all you want, you will never move me; I am hard, rigid, and unbreakable!' The river did not argue or fight with brute force. Instead, it smiled, flowed fluidly around the curves, and kept gently, continuously brushing against the boulder day after day, year after year, through summer heat and winter snow. Over time, the gentle, persistent water carved a deep, smooth path straight through the middle of the hard rock. Persistence and adaptability always conquer stubborn rigidity.