一切經音義 9.140

9.140

心行（下庚反謂遊履也放光經云意所趣向光讚經云所趣所行大論云問云何悉知眾生心行答菩薩知眾生種種法中處處行即維摩經云善知眾生往來所趣及心所行其義一也今人有讀為下孟反誤也）。

Mental activity (心行; the second character has the fanqie h- [下] + -g- [庚]; meaning roaming and stepping; the Fangguang jing says: "that whereto the mind tends"; the Guangzan jing says: "where one tends and goes"; the Da zhidu lun says: "Question: How are the mental activities of sentient beings fully known? Answer: The bodhisattva knows that sentient beings move everywhere amidst various phenomena"; that is what the Vimalakīrti-sūtra means by "well knowing the comings, goings, inclinations, and mental activities of sentient beings", the meaning of which is one and the same; people today who read it with the fanqie x- [下] + -m- [孟] are mistaken).