Diamond Sūtra 3

Then the Bhagavat thus spoke to him: Any one, O Subhati, who has entered here on the path of the Bodhisattvas must thus frame his thought: As many beings as there are in this world of beings, comprehended under the term of beings (either born of eggs, or from the womb, or from moisture, or miraculously), with form or without form, with name or without name, or neither with nor without name, as far as Sete 8 No es ee any known world of beings is known, all these must be delivered by me in the perfect world of Nirvana. And yet, after I have thus delivered immeasurable beings, not one single being has been delivered. And why? If, O Subhuti, a Bodhisattva had any idea of (belief in) a being, he could not be called a Bodhisattva (one who is fit to become a Buddha). And why? Because, O Subhuti, no one is to be called a Bodhisattva, for whom there should exist the idea of a being, the idea of a living being, or the idea of a person.’