Balance is a good theory, but that would give us little to do considering the Universe seems to have a natural balance, whereby unbalances are sorted out by the appearance of an opposite. That was the point behind the two sides of the equation in the Matrix films. Keep balance comes naturally, so long as you don't resist (which would only slow the inevitable at best).

The term opposite is strange... By definition, it means completely different... But in a Mathematical equation, while both sides are opposite, their value must be the same.