Who regarded "truth" as "straight eight" among celebrities in past dynasties?

Confucius led his disciples to study abroad. One day at noon, he was too hungry to walk, so he went to a family to beg. The host said that as long as you know one word, you can eat. Disciples think that testing Confucius' cultural level will be the biggest joke in the world. The disciple read the master's handwriting on the ground and said, "Why bother my master?" The word is pronounced "true". The master shook his head and said it was wrong. Confucius looked forward and said that this word recognized "straight eight". The host was right and gave them a sumptuous meal. Confucius deserves to be the first saint in China. He knows that when people pronounce "truth" as "straight eight" before eating, why should they take it as "truth"? Why can't we read "truth" as "straight eight" when we can only meet our own food needs by satisfying the psychological needs of our hosts such as banter and ridicule?