'Gǔ rén yún' literally means 'the ancients said' — a classical, literary phrase used to introduce a well-known proverb, quotation, or traditional wisdom. The character 古 (gǔ) means 'ancient' or 'old', 人 (rén) means 'person' or 'people', and 云 (yún) is an archaic verb meaning 'to say' (equivalent to modern 说 shuō). Together, the phrase functions as a fixed expression that signals respect for inherited knowledge and adds rhetorical weight to an argument or observation.

This phrase appears frequently in formal writing, essays, speeches, and classical-style compositions — rarely in casual speech. It often precedes a timeless saying, such as '天时不如地利' (timing is less important than location), and serves both an explanatory and persuasive function. Learners should recognize it as a stylistic marker of formality and cultural authority, not as a literal description of who is speaking.