We need to be rigid in our rules so that we gain a sense of self-trust that can, and will always, protect us in an environment that has few, if any, boundaries. We need to be flexible in our expectations so we can perceive, with the greatest degree of clarity and objectivity, what the market is communicating to us from its perspective.
It's like what Ronny Kagen said about being attached to your activities or actions, but detached from the outcome.