Thomas Keating — American Clergyman born on March 07, 1923,

For the famous art forger of the same name, see Tom Keating. For the American football player of the same name, see Tom Keating... (wikipedia)

In centering prayer, the sacred word is not the object of the attention but rather the expression of the intention of the will.
If you accept the belief that baptism incorporates us in the mystical body of Christ, into the divine DNA, then you might say that the Holy Spirit is present in each of us, and thus we have the capacity for the fullness of redemption, of transformation.
Redemption basically is about holistic health, if you want to translate it into modern parlance. What I suggest - based on the Christian tradition but not often preached - is that you can't enter into the fullness of the Pascal mystery of the redemption unless there is a radical transformation of motivation within you.
Psychotherapy is what God has been secretly doing for centuries by other names; that is, he searches through our personal history and heals what needs to be healed - the wounds of childhood or our own self-inflicted wounds.
While doing centering prayer, the practice is to let go of any thought or perception. The priority is to be as silent as possible and when that is not possible to let the noise of the thoughts be the sacred symbol for a while, without analyzing them.