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Once, a king asked one of his servants to bring him the best meat from the market. The servant brought a tongue. The following day the king requested for the worst meat in the market. The servant brought the tongue again.
"What?" the king asked. "When I asked for the best meat, you brought the tongue and now I requested for the worst meat, and you've brought the tongue?"
The servant said, "Sometimes a man is very unhappy because of his tongue and sometimes his tongue makes him very happy."
"You're right," said the king. "Let's make the masters of our tongue!