The Twelve Books on the Institutes of the Cœnobia, and the Remedies for the Eight Principal Faults

If then we say that these impulses were implanted in us by the Creator, He will not on that account seem blameworthy, if we choose wrongly to abuse them, and to pervert them to harmful purposes, and are ready to be made sorry by means of the useless Cains of this world, and not by means of showing penitence and the correction of our faults: or at least if we are angry not with ourselves (which would be profitable) but with our brethren in defiance of God’s command. For in the case of iron, which is given us for good and useful purposes, if any one should pervert it for murdering the innocent, one would not therefore blame the maker of the metal because man had used to injure others that which he had provided for good and useful purposes of living happily.