Keep It Simple
Over-complication seems to be a by product. of.. well, a by product of something, I'm not sure what. Simplicity is elegant, and so simple that it can escape our attention.
Take the Simplest Route, Not the Shortest
Without realising it we have a habit of complicating our lives by choosing solutions to problems that are ineffective or even aggravate the difficulty. Simplest is best, so look for explanations that require the least number of guesses and speculations.