成唯識論述記 3.311

3.311

述曰：相分心心所，如化心等，故不緣之，緣便無用。《深密經》說：諸變化心無自依心，有依他心，《佛地論》第六卷、此第十亦云：無自緣慮實體之心，有隨見分所變相分似慮之心，如鏡中火，乃至廣說。問：若爾，何故心心所法從第八生？既不能變，不須生故。

The Commentary states: The nimittabhāga of mind and mental factors is like a magically created mind and so forth; therefore, it does not cognize them, as cognizing them would be without functional efficacy. The Saṃdhinirmocana-sūtra states: 'All magically created minds have no mind of their own basis; they have the mind of dependent nature.' The Buddhabhūmi-śāstra, fascicle six, and this text, fascicle ten, also state: 'There is no mind that is a real entity of self-cognition and deliberation; there is only a mind resembling deliberation that is a nimittabhāga transformed in accordance with the darśanabhāga, like fire in a mirror,' and so forth at length. Question: If so, why are the dharmas of mind and mental factors produced from the eighth? Since they cannot be transformed, they need not be produced.