"In Heaven, there are no debts - all have been paid, one way or another - but in Hell there's nothing but debts, and a great deal of payment is exacted, though you can't ever get all paid up. You have to pay, and pay, and keep on paying. So Hell is like an infernal maxed-out credit card that multiplies the charges endlessly."

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Love interest nearly always weakens a mystery because it introduces a type of suspense that is antagonistic to the detective's struggle to solve the problem. It stacks the cards, and in nine cases out of ten, it eliminates at least two useful suspects. The only effective love interest is that which creates a personal hazard for the detective - but which, at the same time, you instinctively feel to be a mere episode. A really good detective never gets married.

— Raymond Chandler