A potentiality often remote and vain, as the potentiality of sight when the eye is gouged out, or the potentiality of truth and justice in the devil. But the fact remains that all positive physical being, as such, is of itself good; and however it be beset with evil, that circumstance is strictly accidental. Cf. Heb. xii, 1, besetting sin. Sin besets, but never quite absorbs, the work of God. -- Besides, the philosopher considers the universal, the species, the normal thing, rather than the individual and accidental: and the normal state of things is good, not evil.
Of God and His Creatures: 3.12