The Buddha was talking with Uttara, a young pupil of the bhramin Parasariya:
-Uttara, does Parasariya teach you how to develop your faculties?
-Yes, Master Gotama, he does teach us how to develop our faculties
-How does he do...
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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