The light that shines in the eye is really the light of the heart. The light that fills the heart is the light of God, which is pure and separate from the light of intellect and senses.
In centering, we begin to leave aside our own thoughts and images and feelings and to make space for the Spirit to begin to operate in us through the gifts. Outside the time of prayer we begin--and often others begin before us--to perceive the presence of these wonderful gifts in our daily lives. These are the fruits by which we judge the "tree" of our centering prayer. It is only through these fruits and the healing they represent that we can know the spirit is working in our lives through this deep, quiet communion with Love at the center of our being.
~ from THE CALL TO THE CENTER by M. Basil Pennington