The Crab and Its Mother

A crab said to her son, "Why do you walk so one-sided, my child? It is far more becoming to go straight forward."  The young Crab replied:  "Quite true, dear Mother; and if you will show me the straight way, I will promise to walk in it."  The Mother tried in vain, and submitted without remonstrance to the reproof of her child. 

Example is more powerful than precept.