80% sureThese words were traced back to where they first appeared. That source is listed below.
What turned up
Instructions for Practical Living (Chuanxi lu), sec. 5, dialogue with disciple Xu Ai; wording follows Wing-tsit Chan's 1963 translation. The same passage appears in F. G. Henke's 1916 translation (pp. 53-54)
Sources checked
archive.orgChecked using claude-fable-5, 21 August 2026Henke's 1916 public-domain translation, full text: 'No one who really has knowledge fails to practice it. Knowledge without practice should be interpreted as lack of knowledge' — the same Chuanxi lu sentence Chan renders as our quote
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