The wise man, Saadi of Shiraz, was walking along a road with his disciple when he saw a man trying to get his mule to move. When the animal refused to budge, the man began calling him the worst names he could think of. 'Don't be silly,' said Saadi. 'The mule will never learn your language. You would do better to calm down and learn his language.' And as he walked away, he remarked to his disciple: 'Before you get into an argument with a mule, remember the scene you have just witnessed.'
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