Whoever says that the Tathāgata goes or comes, stands, sits or lies down, he does not understand the meaning of my teaching. And why?Diamond Sutra, verse 29
‘Tathāgata’ is called one who has not gone anywhere, nor come from anywhere.
The Buddhist state is instantaneous, immediate, and cuts off past and future.
‘Tathāgata’ means ‘thus come’ or ‘thus gone. The name itself is a description of reality; not ‘existence’ [because that would entail dualism], not ‘no existence’ [because that would entail nihilism] but something luminous, hovering in the background, behind our conceptualisations.