EVODIUS: Now explain to me, if you can, why God gave human 1. beings free choice of the will, since if we had not received it, we would not have been able to sin.
AUGUSTINE: Do you know for certain that God gave us this thing that you think should not have been given?
EVODIUS: If I understood Book One correctly, we have free choice of the will and we cannot sin without it.
AUGUSTINE: I too remember that that had become quite clear to us. But what I asked just now was whether you knew that it was God who gave us this thing, which we clearly have and by which we sin.
EVODIUS: Who else would it be? For we have our existence from God, and it is from him that we deserve punishment for doing wrong and reward for doing good.
AUGUSTINE: Here again I want to know whether you know this for certain, or whether you willingly believe it on the urging of some authority, without actually knowing it.
EVODIUS: I admit that at first I believed this on authority. But what could be truer than that everything good comes from God, that everything just is good, and that it is just for sinners to be punished and the good rewarded? From this I conclude that it is God who afflicts sinners with unhappiness and confers happiness on the good.
AUGUSTINE: I make no objection. But I do have one further question: How do you know that we have our existence from God? You did not explain that; you showed only that it is from him that we deserve punishment or reward.
EVODIUS: That is an obvious consequence of the fact that God, as the source of all justice, punishes sins. It may be that goodness confers benefits on those not committed to its charge, but justice does not punish those not in its jurisdiction. So it is obvious that we belong to God, because he is not only most generous in conferring benefits but also most just in punishing.
Furthermore, I claimed, and you agreed, that everything good is from God. From this we can understand that human beings too are from God. For human beings as such are good things, since they can live rightly if they so will.