Shariputra: Why do you not change your female physical form?
Goddess: For the past 12 years I have searched in vain for a female form; what do you want me to change? This is like an illusionist who creates an illusionary woman. Is it correct to ask him to change this unreal woman?
Shariputra: No, since it is an unreal form, what can it be changed into?
Goddess: Likewise, all phenomena are unreal. So why have you asked me to change my unreal female form?
At this point, the goddess used her supernatural powers to transform Shariputra into a goddess and herself into a man similar to him.
Goddess: Why do you not change your female form?
Shariputra: I do not know why I have turned into a goddess!
Goddess: If you can change your female form, then all women should also be able to turn into men. Like Shariputra, who is not a woman but appears in a female form, all women are no different. Though they appear in female form, they are fundamentally not women. Hence the Buddha said, "All things are neither male nor female".
The goddess then used her supernatural powers again to transform Shariputra back into his original male form.
Goddess: Where is your female form now?
Shariputra: The form of a woman is neither existent nor non-existent.
Goddess: In the same way, all things are fundamentally neither existent nor non-existent; and that which is neither existent nor non-existent is proclaimed by the Buddha.