that humankind possess the ability to reason as a substantive trait, but they argue that it is in a relationship with God that the true image is made evident. Later theologians like Karl Barth and Emil Brunner argue that it is our ability to establish and maintain complex and intricate relationships that make us like God. For example, in humans the created order of male and female is intended to culminate in spiritual as well as physical unions , reflecting the nature and image of God. Since other creatures do not form such explicitly referential spiritual relationships, these theologians see this ability as uniquely representing the imago dei in humans. For Severian of Gabala (AD 425) the Image of God does not refer to any human nature (corporeal and spiritual), but the relationship with God. "From this we learn that man is not the image of God because of his soul from him or because of his body from him. If that were the case, woman would be the image of God in exactly the same way as man, because she too has a soul and a body. What we are talking about here is not nature but a relationship. For just as God has nobody over him in all creation, so man has no one over him in the natural world. But a woman does she has man over her". In the Modern Era, the Image of God was often related to the concept of "freedom" or "free will" and also relationality. Emil Brunner, a twentieth century Swiss Reformed theologian, wrote that "the formal aspect of human nature, as beings 'made in the image of God", denotes being as Subject, or freedom; it is this which differentiates humanity from the lower creation." He also sees the relationship between God and humanity as a defining part of what it means to be made in God's image. Paul Ricoeur, a twentieth century French philosopher best known for combining phenomenological description with hermeneutics, argued that there is no defined meaning of the imago dei, or at the very least the author of Genesis 1 "certainly did not master at once all its implicit wealth of meaning." He went on to say that "In the very essence of the individual, in terms of its quality as a subject; the image of God, we believe, is the very personal and solitary power to think