grave wrong that could only be stopped by violence would be a sin. Defense of one's self or others could be a necessity, especially when authorized by a legitimate authority. While not elaborating the conditions necessary for war to be just, Augustine nonetheless originated the very phrase, itself, in his work The City of God. In essence, the pursuit of peace must include the option of fighting with all of its eventualities in order to preserve peace in the long-term. Such a war could not be pre-emptive, but defensive, to restore peace. Thomas Aquinas, centuries later, used the authority of Augustine's arguments in an attempt to define the conditions under which a war could be just. Irenaean theodicy Irenaeus (died ), born in the early 2nd century, expressed ideas which explained the existence of evil as necessary for human development. Irenaeus argued that human creation comprised two parts: humans were made first in the image, then in the likeness, of God. The image of God consists of having the potential to achieve moral perfection, whereas the likeness of God is the achievement of that perfection. To achieve moral perfection, Irenaeus suggested that humans must have free will. To achieve such free will, humans must experience suffering and God must be at an epistemic distance (a distance of knowledge) from humanity. Therefore, evil exists to allow humans to develop as moral agents. In the 20th century, John Hick collated the ideas of Irenaeus into a distinct theodicy. He argued that the world exists as a "vale of soul-making" (a phrase that he drew from John Keats), and that suffering and evil must therefore occur. He argued that human goodness develops through the experience of evil and suffering. Origenian theodicy In direct response to John Hick's description of theodicy, Mark Scott has indicated that neither Augustine of Hippo nor Irenaeus of Lyons provide an appropriate context for the discussion of Hick's theistic version of theodicy. As a theologian among the Church Fathers who articulated a theory of (or universal reconciliation), Origen of Alexandria provides a more direct theological comparison for the discussion of Hick's presentation of universal salvation and theodicy. Neither Irenaeus nor Augustine endorsed a theology of universal salvation in any form comparable to that of John Hick. Relatively minor theodicies Michael Martin summarizes what he calls "relatively minor" theodicies: The Finite God theodicy maintains that God is all-good (omnibenevolent) but