where do you go mentally when you've completely transcended

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where do you go mentally when you've completely transcended morality, superstition, and realize that everything that could be considered important to a human being is all part of imagination? I mean, once you start getting into sartre territory, it starts to seem counter productive, to say every "thought" or "thing" is just an abstract concept and we don't really "know" anything. At that point you might as well just lay down and become a vegetable or die. We need to go deeper, lit. Is there a book, preferably an entertaining fiction that will show me that way?