The soul united to God and transformed in him draws from within God a divine breath, much like the most high God himself. And God, abiding in the soul, breathes forth the life of the soul as its exemplar. This I take to be what Paul meant when he said: because you are children of God, God has sent to the Spirit of his Son into your heart's crying, Abba, Father; this is what takes place in those who have achieved perfection.
-- St. John of the Cross