The fact is there is nothing that we are doing that God could not raise up a stone in the field to do for him. The realization of this puts us in our true place. Though, lest we get too knocked down by such a realization of our insignificance, let me hasten to add that there is one thing that we alone can give God . . . and that is our personal love. No one else can give God our personal love. This is our great significance.
M. Basil Pennington and Thomas Keating. Finding Grace at the Center: The Beginning of Centering Prayer. (Skylight Paths Publishing, 2002.