Please read the entire Diamond Sutra
"Why is this so? If, Subhuti, a bodhisattva holds on to the idea
that a self, a person, a living being, or a life span exists, that
person is not an authentic bodhisattva."
"What do you think, Subhuti? Does a Stream-Enterer think, 'I
have attained the fruit of stream-entry.'?"
Subhuti replied, "No, World-Honored One. Why? Stream-Enterer means
to enter the stream, but in fact there is no stream to enter. One
does not enter a stream that is form, nor a stream that is sound,
smell, taste, touch, or object of mind. That is what we mean when
we say entering a stream."
"What do you think, Subhuti? Does a Once-Returner think, 'I have
attained the fruit of Once-Returning.'?"
Subhuti replied, "No, World-Honored One. Why? Once-Returner means
to go and return once more, but in truth there is no going just as
there is no returning. That is what we mean when we say
Once-Returner."
"What do you think, Subhuti? Does a Non-Returner think like this,
'l have attained the fruit of No-Return.'?"
Subhuti replied, "No, World-Honored One. Why? No-Return means not
to return to this world, but in fact there cannot be any
Non-Returning. That is what we mean when we say
Non-Returner."
"What do you think, Subhuti? Does an Arhat think like this, 'I have
attained the fruit of Arhatship¹?"
Subhuti replied, "No, World-Honored One. Why? There is no
separately existing thing that can be called Arhat. If an Arhat
gives rise to the thought that he has attained the fruit of
Arhat-ship, then he is still caught up in the idea of a self, a
person, a living being, and a life span. World-Honored One, you
have often said that I have attained the concentration of peaceful
abiding and that in the community, I am the Arhat who has most
transformed need and desire. World-Honored One, if I were to think
that I had attained the fruit of Arhat-ship, you certainly would
not have said that I love to dwell in the concentration of peaceful
abiding."