In poker, I'm told, it's important not to think of any of the money in the pot as your money. If you put $10 in the pot before the draw, you just have to forget that fact. If, after the draw, you keep thinking of that $10, you'll be betting to protect your investment. And you'll make bad decisions. There's even a common phrase expressing that advice: "Don't throw good money after bad."
In writing, the principle is the same. If you think of the time and effort you've invested in a piece of writing, you're bound to be reluctant to change anything. To be an effective business writer, however, you simply have to lose that reluctance. As poet John Berryman said, "One must be ruthless with one's own writing or someone else will be."

Sir Arthur Quiller-Couch expressed the same idea well: "Murder your darlings."
Posted by: Ray | 07 July 2009 at 09:15 PM