Book 2: 《為政》 Wei Zheng (Governance)
《為政》 Passage 2.2
子曰：「詩三百，一言以蔽之，曰『思無邪』。」
Legge Translation (1861)
The Master said: "In the Book of Poetry are three hundred pieces, but the design of them all may be embraced in one sentence — 'Having no depraved thoughts.'"