 From the notion of a most perfect being, Wolff purports to prove God is an ens realissimum (or most real existing being). However, like Leibniz before him commenting on the Cartesian ontological proof, Wolff believes God must first be shown to be possible in order to be shown to exist. According to Wolff, arriving at the knowledge of God as an ens perfectissimum involves first contemplating the attributes that are present in the human soul, to a limited degree, and then extrapolating those attributes as unlimited qualities to God. Things are compossible insofar as they can coexist in the same subject. Since existence is a mode or reality for Wolff, existence is considered to fall within the class of compossible realities. And just as it is better to exist than not to exist, it is better to exist necessarily than just to exist contingently, therefore Wolff concludes that God’s existence is necessary.