Centering Prayer and the distraction of thoughts
(Fr Thomas Keating, Open Mind, Open Heart, pp.110-115)
To undertake Centering Prayer systematically, take up a comfortable position that will enable you to sit still. Close your eyes. Half of the world disappears for we generally think most about what we see. In order to slow down the usual flow of thoughts, think just one thought. For this purpose, choose a word of one or two syllables with which you feel comfortable.
A general loving look toward God may be better suited to the disposition of some persons. But the same procedures are followed as in the use of the sacred word. The word is a sacred word because it is the symbol of your intention to open yourself to the mystery of God's presence beyond thoughts, images and emotions. It is chosen not for its content but for its intent. It is merely a pointer that expresses the direction of your inward movement toward the presence of God.
To start, introduce the sacred word in your imagination as gently as if you were laying a feather on a piece of absorbent cotton. Keep thinking the sacred word in whatever form it arises. It is not meant to be repeated continuously. The word can flatten out, become vague or just an impulse of the will, or even disappear. Accept it in whatever form it arises.
When you become aware that you are thinking some other thought, return to the sacred word as the expression of your intent. The effectiveness of this prayer does not depend on how distinctly you say the sacred word or how often, but rather on the gentleness with which you introduce it into your imagination in the beginning and the promptness with which you return to it when you are hooked on some other thought.
Thoughts are an inevitable part of Centering Prayer. Our ordinary thoughts are like boats sitting on a river so closely packed together that we cannot see the river that is holding them up. A "thought" in the context of this prayer is any perception that crosses the inner screen of consciousness. We are normally aware of one object after another passing across the inner screen of consciousness: images, memories, feelings, and external impressions. When we slow down that flow for a little while, space begins to appear between the boats. Up comes the reality on which they are floating.
The prayer of centring is a method of directing your attention from the particular to the general, from the concrete to the formless. At first you are preoccupied by the boats that are going by. You become interested in seeing what is on them. But just let them all go by. If you catch yourself becoming interested in them, return to the sacred word as the expression of the movement of your whole being toward God present within you.