“Before enlightenment, mountains are mountains and waters are waters;
after a first glimpse into the truth, mountains are no longer
mountains and waters are no longer waters;
after enlightenment, mountains are once again mountains and waters once again waters.”
— Zen saying

First you see duality
Then you see non-duality
Then finally you look at and see duality with the depth and clarity of non-duality which is to say not two-not one and not not two not not one either. Just as it is. Free of projection. Free of/less and less ntainted by “me”a.k.a. free of "as *I* want to see".

saṃsāra is saṃsāra. nirvāṇa is nirvāṇa. saṃsāra is not nirvāṇa. nirvāṇa is not saṃsāra.
saṃsāra is not necessarily saṃsāra, nirvana is not necessarily nirvāṇa.
saṃsāra is nirvāṇa, nirvāṇa is saṃsāra, but also saṃsāra is saṃsāra, nirvāṇa is nirvāṇa.

Going through is going out. Trying to go out is going in (a.k.a. entering deeper delusion of (compulsive) Thought by way of identification).
Going through is not necessarily always going out. Going out can actually be going out.
All depends on degree of clarity of sight and truthfulness.
End of becoming/not becoming. End of “me" and its many torments.
To do without doing. Move without moving.
No need to cling to passing thoughts even as one seems to enter them and as they move through us.

All this to say no point in confusing one thing for another even as the other thing is just an effect of THAT.
To just see things.. as they are.. without the deceptions of mind.

(Please note that everytime I seem to be critiquing Thought, I am just referring to you/anyone being used/deceived by it and not the You /You using Thought).