Tickle, tickle, tickle. What do you mean? Who is the famous saying?
Confucius said, "You, teach your daughter to know! Knowing is knowing, not knowing is not knowing, but knowing. " It means: knowing is knowing. Don't know is don't know, this is smart. It means to have a correct attitude towards learning, and it also means to be honest. This is a sentence in Ten Analects of Confucius, a famous saying of Confucius and his disciples.