Hatred, in the course of time, kills the unhappy wretch who delights in nursing it in his bosom.
But I think the real tension lies in the relationship between what you might call the pursuer and his quarry, whether it's the writer or the spy.
Everything that works in sales has been done already. Just keep track of the crap that you buy, or the awesome stuff that you buy, and decide what was the trigger, and then just sell to people like you. It's really that easy - and that's what I do.

