This is literally, exactly as it is. Therefore, it is not a matter of logic, nor is it a simple textbook rule, nor is it a simple physical law, but literally and exactly the same for oneself and others, a state of oneness.

When put into words, it is nothing special, and it is exactly what is said in spiritual and mental worlds, and there is nothing particularly new about the words. However, when you actually experience it, it is literally exactly as it is, so you can understand that what has been said by many people since ancient times is true, exactly as it is.

However, I think this is still a limited area of oneness. In terms of Vedanta, I think it is still oneness as Atman (the true self).

However, I think that it is unlikely that a human being living in this world will experience Brahman (the ultimate reality) as a "whole." Therefore, I think that we are experiencing oneness as Atman within a certain limited area.

In some schools of thought, there is no distinction here, and logically, Atman is indeed Brahman, so the logic that Atman is "the whole" can be said to be valid. However, a living human being does not actually reach the level of "the whole," and there is a discrepancy there, so Atman is, in a sense, equivalent to the "individual" as a convenient term, and is in a state of oneness as an "individual."

Some people may think that this is a contradiction, because it is oneness, but why is it an "individual"? However, the existence of Atman is used as a convenient term in the sense that its scope is still limited. On the other hand, Brahman is "the whole," so both are oneness, but there is a discrepancy.

What I am saying here is the oneness of Atman, which is within a certain limited scope, and it is literally the same for oneself and others.

Logically, as the Vedanta school says, Atman and Brahman are the same, so it can be said that Atman is "the whole." However, the fact that these two are different expressions is appropriate in reality, and our individual consciousness is oneness within a limited scope, so it is unlikely that we will truly become "the whole," at least not in our short lives.