What goes on in those silent depths during the time of Centering Prayer is no one's business, not even your own; it is between your innermost being and God; that place where, as St. Augustine once said, "God is closer to your soul than you are yourself."  your own subjective experience of the prayer may be that nothing happened--except for the more or less continuous motion of letting go of thoughts.  But in the depths of your being, in fact, plenty has been going on, and things are quietly but firmly being rearranged.

Cynthia Bourgeault, Centering Prayer and Inner Awakening, pg. 6