Having been made one with God, the soul is somehow God through participation. Although it is not God as perfectly as it will be in the next life, it is like the shadow of God. Being the shadow of God through this substantial transformation, it performs in this measure in God and through God what He, through Himself, does in it. For the will of the two is one will, and thus God's operation and the soul's is one. (1) ... When there is union of love, the image of the Beloved is so sketched in the will and drawn so vividly, that it is true to say that the Beloved lives in the lover and the lover in the Beloved. Love produces such likeness in this transformation of lovers that one can say each is the other and both are one. The reason is, that in the union and transformation of love, each gives possession of self to the other, and each leaves and exchanges self for the other. Thus each one lives in the other and is the other, and both are one in the transformation of love. (2) ...Thus, no one ... can disturb the soul that is liberated and purged of all things and united with God. She enjoys now in this state a habitual sweetness and tranquility which is never lost or lacking to her. (3)

(Saint John of the Cross)