1 Objection 1: It seems that God does not know evil things. For the Philosopher De Anima iii) says that the intellect which is not in potentiality does not know privation. But evil is the privation of good, as Augustine says Confess. iii, 7). Therefore, as the intellect of God is never in potentiality, but is always in act, as is clear from the foregoing Article 2), it seems that God does not know evil things.
1 Ad decimum sic proceditur. Videtur quod Deus non cognoscat mala. Dicit enim philosophus, in III de anima, quod intellectus qui non est in potentia, non cognoscit privationem. Sed malum est privatio boni, ut dicit Augustinus. Igitur, cum intellectus Dei nunquam sit in potentia, sed semper actu, ut ex dictis patet, videtur quod Deus non cognoscat mala.
2 Objection 2: Further, all knowledge is either the cause of the thing known, or is caused by it. But the knowledge of God is not the cause of evil, nor is it caused by evil. Therefore God does not know evil things.
2 Praeterea, omnis scientia vel est causa sciti, vel causatur ab eo. Sed scientia Dei non est causa mali, nec causatur a malo. Ergo scientia Dei non est malorum.
3 Objection 3: Further, everything known is known either by its likeness, or by its opposite. But whatever God knows, He knows through His essence, as is clear from the foregoing Article 5). Now the divine essence neither is the likeness of evil, nor is evil contrary to it; for to the divine essence there is no contrary, as Augustine says De Civ. Dei xii). Therefore God does not know evil things.
3 Praeterea, omne quod cognoscitur, cognoscitur per suam similitudinem, vel per suum oppositum. Quidquid autem cognoscit Deus, cognoscit per suam essentiam, ut ex dictis patet. Divina autem essentia neque est similitudo mali, neque ei malum opponitur, divinae enim essentiae nihil est contrarium, ut dicit Augustinus, XII de Civ. Dei. Ergo Deus non cognoscit mala.
4 Objection 4: Further, what is known through another and not through itself, is imperfectly known. But evil is not known by God; for the thing known must be in the knower. Therefore if evil is known through another, namely, through good, it would be known by Him imperfectly; which cannot be, for the knowledge of God is not imperfect. Therefore God does not know evil things.
4 Praeterea, quod cognoscitur non per seipsum, sed per aliud, imperfecte cognoscitur. Sed malum non cognoscitur a Deo per seipsum, quia sic oporteret quod malum esset in Deo; oportet enim cognitum esse in cognoscente. Si ergo cognoscitur per aliud, scilicet per bonum, imperfecte cognoscetur ab ipso, quod est impossibile, quia nulla cognitio Dei est imperfecta. Ergo scientia Dei non est malorum.
5 On the contrary, It is written Prov. 15, 11), Hell and destruction are before God Vulg: the Lord').
5 Sed contra est quod dicitur Proverb. XV, Infernus et perditio coram Deo.
6 I answer that, Whoever knows a thing perfectly, must know all that can be accidental to it. Now there are some good things to which corruption by evil may be accidental. Hence God would not know good things perfectly, unless He also knew evil things. Now a thing is knowable in the degree in which it is; hence since this is the essence of evil that it is the privation of good, by the fact that God knows good things, He knows evil things also; as by light is known darkness. Hence Dionysius says Div. Nom. vii): God through Himself receives the vision of darkness, not otherwise seeing darkness except through light.
6 Respondeo dicendum quod quicumque perfecte cognoscit aliquid, oportet quod cognoscat omnia quae possunt illi accidere. Sunt autem quaedam bona, quibus accidere potest ut per mala corrumpantur. Unde Deus non perfecte cognosceret bona, nisi etiam cognosceret mala. Sic autem est cognoscibile unumquodque, secundum quod est. Unde, cum hoc sit esse mali, quod est privatio boni, per hoc ipsum quod Deus cognoscit bona, cognoscit etiam mala; sicut per lucem cognoscuntur tenebrae. Unde dicit Dionysius, VII cap. de Div. Nom., quod Deus per semetipsum tenebrarum accipit visionem, non aliunde videns tenebras quam a lumine.
7 Reply to Objection 1: The saying of the Philosopher must be understood as meaning that the intellect which is not in potentiality, does not know privation by privation existing in it; and this agrees with what he said previously, that a point and every indivisible thing are known by privation of division. This is because simple and indivisible forms are in our intellect not actually, but only potentially; for were they actually in our intellect, they would not be known by privation. It is thus that simple things are known by separate substances. God therefore knows evil, not by privation existing in Himself, but by the opposite good.
7 Ad primum ergo dicendum quod verbum philosophi est sic intelligendum, quod intellectus qui non est in potentia, non cognoscit privationem per privationem in ipso existentem. Et hoc congruit cum eo quod supra dixerat, quod punctum et omne indivisibile per privationem divisionis cognoscitur. Quod contingit ex hoc, quia formae simplices et indivisibiles non sunt actu in intellectu nostro, sed in potentia tantum, nam si essent actu in intellectu nostro, non per privationem cognoscerentur. Et sic cognoscuntur simplicia a substantiis separatis. Deus igitur non cognoscit malum per privationem in se existentem, sed per bonum oppositum.
8 Reply to Objection 2: The knowledge of God is not the cause of evil; but is the cause of the good whereby evil is known.
8 Ad secundum dicendum quod scientia Dei non est causa mali, sed est causa boni, per quod cognoscitur malum.
9 Reply to Objection 3: Although evil is not opposed to the divine essence, which is not corruptible by evil; it is opposed to the effects of God, which He knows by His essence; and knowing them, He knows the opposite evils.
9 Ad tertium dicendum quod, licet malum non opponatur essentiae divinae, quae non est corruptibilis per malum, opponitur tamen effectibus Dei; quos per essentiam suam cognoscit, et eos cognoscens, mala opposita cognoscit.
10 Reply to Objection 4: To know a thing by something else only, belongs to imperfect knowledge, if that thing is of itself knowable; but evil is not of itself knowable, forasmuch as the very nature of evil means the privation of good; therefore evil can neither be defined nor known except by good.
10 Ad quartum dicendum quod cognoscere aliquid per aliud tantum, est imperfectae cognitionis, si illud sit cognoscibile per se. Sed malum non est per se cognoscibile, quia de ratione mali est, quod sit privatio boni. Et sic neque definiri, neque cognosci potest, nisi per bonum.