I think i read somewhere that he was coaxed into stating it was mostly fictional. Much of it is based on supposed fact. Many of the allusions in his works are based on real world juxtapositions. Are you absolutely certain that you are not the impressionable one? This can be argued both ways I suppose. People will tend to believe what builds upon what they already believe. Any way, I recommend this book to everybody, especially people who have begun to question their existence.
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Any thing that can happen, will happen, has already happened, and is happening right now.