The Economist's obituary for William Safire:
"Had William Safire written his own obituary, he would have laid down a few simple rules. First, use the active, not the passive voice, no matter how inert the corpse. Second, taking the bull by the hand, nix those mixed metaphors. Third, kill all sentences starting with conjunctions, or ending in “by”, “with”, or “on”.
Safire, of course, would have been entitled to doggedly subject whatever he set out to write about himself to whatever syntactical restrictions he believed in. Nevertheless these particular 'simple rules' are prescriptive nonesense.