Sourced
Learning without thought is labour lost; thought without learning is perilous.
Source: Analects 2.15, tr. James Legge
Authors / Confucius
The Analects were compiled by his followers after his death. We quote James Legge's classic 1861 translation, numbered by book and passage; the slick modern "Confucius says" lines usually have no Analects source at all.