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"It is not that I am mad; it is only that my head is different from yours.”
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Well first sentences can be misleading. I usually know if it's a bad book once it's too late and I'm already home reading. How do I know? I keep putting it down and picking it up and putting it down. A good book always holds my attention. Likewise I hold the receipt for the bad ones.
"Get thee to a nunnery."
I don't usually buy random books. I like to get recommendations or browse Wikipedia for books I think I might like.