Interpretations of the incarnational mystery of the perpetual virginity of the Mother of God were frequently executed by artisans in relational form, most recognisably as Madonna, some works depicting three generations as in Metterza. The mutual reciprocity contained in a personalist phenomological approach to the philosophy of being draws attention to man's need for transcendence, that a duality between good and evil is not sufficient to explain the mystery of human social relations in community. John Henry Newman popularised the Latin aphorism "cor ad cor loquitur" or "heart speaks unto heart" (first coined two centuries before by the Doctor of the Church Frances de Sales, "cor cordi loquitur") to describe adequately communicating the graced intimacy of man's conformity to Jesus' loving obedience to his Father's divine will unto death. Similarly, St. Augustine had written a millennium before, ""Sonus verborum nostrorum aures percutit; magister intus est"", that when a teacher speaks worthily of divine things, as the sound of the words strike our ears, it is no longer mere words but God himself who enters.