Why can't you believe the sentence "a scholar knows half a sentence"

First of all, this sentence is not praising the scholar, but teasing the scholar, because the scholar has a problem, that is, he is not honest in culture. As a writer, it is easy to be lazy sometimes, just like his attitude towards words. He only knows how to pronounce and write this word, but he doesn't know how it is formed, that is, he only knows its appearance but doesn't know its reason. Doesn't that mean you only know half? This is of course just an example.

Secondly, it is very practical for some pictophonetic characters to know half a word. For example, words with the same sound as words can be inferred from half. However, if you encounter something different from the whole word, such as the word "good scale", it will be a joke. Isn't this all wet?

So the original intention of this sentence is not to tell you that literacy depends only on his radicals or pronunciations, but to tease a scholar or scholar!