One day Yao-shan Wei-yen (750-834), one of the well-known Chinese Ch'an master, was asked by the host of the monastery to give his sermon to the assembly who for a long while was expecting his teaching. Yao-shan said: "Strike the bell."
NOT ALLOWED TO SPEAK OF
At some point, something is not allowed to speak of. If someone speaks of, he will get a horn grown on his head.
It is like this: Suppose someone who is a married man and he has met another girl who is very beautiful and attractive to him. He talked to his wife about that girl. At first, his wife showed her understanding and just smiling. However he kept talking about the girl again and again. At some point, his wife stopped smiling and gave him a hard hit on his head. It hurt him badly and he touched his head at the hurt spot with his hand. He felt something protruding there like a new horn of a young big horn. Hope this will help you about "At some point, something is not allowed to speak of..."
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