Why can't we reason or logic our way to NIrvana? I have read at various places that Nirvana can't be described or reached by logic or reason. ONLY meditation is the way. Why is that so? thanks in advance.
I have read at various places that Nirvana can't be described or reached by logic or reason.

I think that's two questions: 1) described, 2) reached.

I think Nirvana is defined as being the end of craving -- not just a temporary pause or lull, but uprooting the "tendencies" and "effluents" which result in the arising of craving -- so changing or undoing habits (if craving is a kind of habit, and results from habits, etc.).

And you can't do something, or accomplish something ("reach" something), just by thinking about it -- you have to do it!

I suppose that's true of everything -- mundane things too not only Nirvana -- e.g. you can't learn to play piano or guitar just by thinking about: you'd have to do it, practice it.

Maybe that's true even of describing something -- I can't describe playing guitar or piano, nor even describe hearing piano or guitar  -- i.e. you'd have to actually do it yourself, play it or hear it, to know it for yourself.