Your use of the word "conception" is inaccurate in this context. Conception means to invent an idea.
Nirvana is a concept to represent the reality that is present to the mind of the meditator when there is no ego self present, iow, it is in a state of non-duality.
Of course monks don't invent the idea of Nirvana. They learn what Nirvana is, and then learn the means to attain that state.
When they understand the conceptual teaching that the reality represented by the concept Nirvana can only be realized when the mind is free from conceptualization, then they may go forward to realize it.
No monk learns that understanding what Nirvana means IS to attain Nirvana. You seem to be confusing what Western religion does.
The monk must understand that the reality of Nirvana is a state of mind free from conceptualizing, if they don't understand that, they may waste their life believing the concept of Nirvana can be experienced by the personal self.
A similar saying is "the more you try to have the truth the farther away you get from it."
No, no ,no, it is not, it means that the the reality represented by the concept truth, is not truth, it is an idea, a concept. To realize truth, one must cease all thought.
This isn't about teachings, which are about some dogma. This is a tutorial. Atheism is a rational approach to religious ideas, namely that it explains that rational minds do not assume any supernatural exists, and only makes conclusions when there is an adequate level of evidence. Religions don't follow this method.
Atheism and Theism are concepts, ideas, religions teach that absolute reality is inconceivable, it is non-dual.
No mortal can attain a state of Nirvana permanently and still function.
A mortal is a mortal, an entity that is in the state of Nirvana permanently is a Buddha, not a mortal.
A Buddha is an enlightened person, not a person in Nirvana
A Buddha who has realized Nirvana permanently means they no longer reincarnate, Nirvana isn't a place, it is universal awareness.
Who is the someone? They wouldn't be boastful and arrogant.
Apprehending reality for what it is, is what it is.
As Krishnamurti would say, the word is not the thing. I knew this before our paths crossed. I'm not sure why you want to think you are teaching me anything. Is your ego that fragile?
It is because you are using your rational mind to try and understand that which is non-dual, using duality to find non-duality is to be down an eternal rabbit hole.
I'm not sure why you are stating these fundamental things that Buddhists know. Are you chest thumping as a display of superiority? That is very primal.
Read back through your conceptualizing is this post and tell me that where you understand that the rational mind, dualistic mind, can not realize Nirvana, non-duality.
Mockery. This is something a person with superior virtue would post.
Inferiority complex or sense of humor, which do you have?