  In The Journey of the Mind to God, c. 5, Bonaventure focuses the ontological argument on “being” and develops it far beyond anything he had previously done. He qualifies esse in two different ways, creating two different middle terms: “divine being” (esse divinum) and “completely pure being (esse purissimum).” First he uses “completely pure being” to deduce the predicate “exists,” then uses “divine being” to ensure that it is God who is so proven to exist. In this way the basic steps of this argument closely parallel those of the argument based on goodness: ‘God (Deus) who is divine being (esse divinum) is also seen to be completely pure being (esse purissimum) and therefore must exist (est).’