  The real but initially hidden starting point for Bonaventure’s ontological argument in the Journey is the notion of esse purissimum, taken not subjectively as existing as a concept in a human mind, but in its objective  meaning,[63]  that is, as signifying a certain kind of quiddity or essence. The achievement of the ontological argument, as Bonaventure saw it, is twofold: it shows that this essence must really exist, and it shows that this essence is none other than God.