Reality is fluid, is process. It seethes and teems with energy, with change: with possibility and unpredictability. Ego, and its ally the thinking mind, cannot function here, so they invent enduring well-behaved models to stand in for reality. These can be as elaborate as scientific or philosophic theory or as crude as simple muscular tension. So our principal method for dealing with ego, for reducing man to the obedience of God, is to work to relax the body of its chronic physical tensions, and the mind of its outmoded models. This is largely a matter of relinquishing control and letting go – allowing one's constricted world-view to open up and expand – and this, after the first flush of excitement, is always terrifying and difficult to bear. In the end it always comes down to faith, sincerity and courage. In other words: heart.