注維摩詰經 6.291

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譬如幻師化作幻女，若有人問：何以不轉女身？是人為正問不？舍利弗言：不也。幻無定相，當何所轉？天曰：一切諸法亦復如是，無有定相。云何乃問不轉女身。

"Just as an illusionist creates an illusory woman: if someone were to ask, 'Why do you not transform your female body?', would that person be asking properly?" Śāriputra said: "No. An illusion has no fixed characteristics; what should be transformed?" The goddess said: "All phenomena are also like this, without fixed characteristics. Why then do you ask why I do not transform my female body?"