One of the analogies used by the Cappadocian Fathers and other early theologians to illustrate the doctrine of the Trinity was the social analogy in which Father, Son and Spirit were likened to three human persons. Beginning with Augustine however, Christian Theology, particularly in the Western Church, shifted away from the social to the psychological analogy. Augustine found analogies to the Trinity in all of creation but the clearest analogy to the Trinity, in fact its unique image, was the human soul. The divine image was not found in the union of three persons but in the unity of three activities, remembering, knowing, willing in the individual human soul. The social analogy reappeared in the twelfth century in Richard of St Victor's argument for the existence of three persons in God based on the premise that supreme charity required shared interpersonal love. Though some of Richard's insights were taken up by Bonaventura, the impact of his trinitarian theology was overshadowed by the dominant influence of Thomas Aquinas with his masterful use of the psychological analogy to probe and illuminate the inner being of the divine Trinity. Following Aquinas's further development of Augustine's psychological analogy, the interpersonal approach of the social analogy all but disappeared from subsequent trinitarian theology. Even with a later shift away from the Augustinian-Thomistic model, modern theology retained its unipersonal image of the trinitarian God.