It's like the grandson who saw his grandfather eating with a wooden bowl [which, not being a more elegant porcelain bowl, was a sign of his children's lack of filial piety]. The grandson then carved wooden bowls for his parents to eat the same way, "explains Tony Liao. Though the logic is sound, this is not easy to do in practice.
「這就是身教：你如果輕慢你的上線，下線看在眼裡，豈不是有樣學樣，就像孫子看到阿公吃飯要『捧木碗』，他也鑿了木碗要給父母吃一樣」，廖誠麟比喻。