1. It means the most correct truth and the most incisive speech. From Lao She's "Drum Calligraphy Artist".

2. A wise saying, a Chinese idiom, whose pinyin is zhìlǐmíngyán.

3. Idiom usage: more formal; used as object.

4. Example: Zou Taofen's "Career Management and Professional Cultivation": "Cadres decide everything. This is an irrefutable saying~."

5. Source of the idiom: Li Luyuan's "Qilu" in the Qing Dynasty "Lamp": "As the saying goes, you must be patient when you expose a debt, and you must be ruthless when repaying a debt. These two sentences are not from the Bible, but they are wise sayings."