Oppose bookishness. "No investigation, no right to speak" comes from "Against Bookishness" (original title: Investigation Work), which was written by Mao Zedong in May 1930 to oppose dogmatism in the Red Army at that time. The article sharply criticized the dogmatism and bookishness existing in the Party and the Red Army at that time, emphasizing that without actual investigation, idealistic class evaluation and idealistic work guidance would be produced, and the result would be either opportunism or recklessness. This assertion later became the slogan of China producers to proceed from reality, go deep into the masses and integrate theory with practice.