In City of God, Augustine famously writes that the two cities are created by two kinds of love: “the Heavenly city by love of God (amor Dei) carried as far as contempt of self,” and the earthly city “by self-love (amor sui) reaching to the point of contempt for God” (ciu. 14.28). Significantly, the grammar of these two loves betrays their difference: one is relational, the other is not. That is, looking at amor Dei grammatically, we can read the “of” contained therein as, at once, the subjective genitive and the objective genitive; both speak of the same love, the former referring to God’s love for us, carried as far as the cross, the latter referring to our return of this love, carried as far as the martyr’s witness.