The Enchiridion 23
23 Summary of the Results of the Preceding Discussion PL 40, 244
As it is right that we should know the causes of good and evil, so much of them at least as will suffice for the way that leads us to the kingdom, where there will be life without the shadow of death, truth without any alloy of error, and happiness unbroken by any sorrow, I have discussed these subjects with the brevity which my limited space demanded. And I think there cannot now be any doubt, that the only cause of any good that we enjoy is the goodness of God, and that the only cause of evil is the falling away from the unchangeable good of a being made good but changeable, first in the case of an angel, and afterwards in the case of man.
Causa rerum bonarum, bonitas Dei; malarum, voluntas deficiens boni mutabilis. His itaque pro hujus brevitatis necessitate tractatis, quoniam causae cognoscendae sunt rerum bonarum et malarum, quantum viae satis est quae nos perducat ad regnum, ubi erit vita sine morte, sine errore veritas, sine perturbatione felicitas: nequaquam dubitare debemus, rerum quae ad nos pertinent bonarum causam non esse nisi bonitatem Dei; malarum vero ab immutabili bono deficientem boni mutabilis voluntatem, prius angeli, hominis postea.