There is no problem with the original sentence. "delusion" and "reality" can both be countable or uncountable, so other article combinations are also possible, but the author has chosen a sensible one.
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Stenka25is there any logic or rule on this that I should know about?Not in the world of grammar. No. Maybe my take on it is somewhat fanciful, and maybe it attempts to psychoanalyze the human unconscious too much, but here's what I think because this is how it strikes me: