A Verb for Nirvana
Thanissaro Bhikkhu

"... There was a time when some philosophers in India reasoned that if nirvana is one place and samsara another, then entering into nirvana leaves you stuck: you've limited your range of movement, for you can't get back to samsara. Thus to solve this problem they invented what they thought was a new kind of nirvana: an unestablished nirvana, in which one could be in both places — nirvana and samsara — at once.

However, these philosophers misunderstood two important points about the Buddha's teachings. The first was that neither samsara nor nirvana is a place. Samsara is a process of creating places, even whole worlds, (this is called becoming) and then wandering through them (this is called birth). Nirvana is the end of this process. You may be able to be in two places at once — or even develop a sense of self so infinite that you can occupy all places at once — but you can't feed a process and experience its end at the same time. You're either feeding samsara or you're not. If you feel the need to course freely through both samsara and nirvana, you're simply engaging in more samsara-ing and keeping yourself trapped...."

A Verb for Nirvana
Thanissaro Bhikkhu
https://www.accesstoinsight.org/lib/authors/thanissaro/nirvanaverb.html