An old crab¹ said to her son, "Why do you walk sideways like that, my son? You ought to walk straight." The young crab replied, "Show me how, dear mother, and I'll follow your example." The old crab tried, but tried in vain², and then saw how foolish she had been to find fault with her child.

 

Example is better than precept（格言，训诫）.

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