1 Objection 1: It seems that God has not knowledge of things that are not. For the knowledge of God is of true things. But truth and being are convertible terms. Therefore the knowledge of God is not of things that are not.
1 Ad nonum sic proceditur. Videtur quod Deus non habeat scientiam non entium. Scientia enim Dei non est nisi verorum. Sed verum et ens convertuntur. Ergo scientia Dei non est non entium.
2 Objection 2: Further, knowledge requires likeness between the knower and the thing known. But those things that are not cannot have any likeness to God, Who is very being. Therefore what is not, cannot be known by God.
2 Praeterea, scientia requirit similitudinem inter scientem et scitum. Sed ea quae non sunt, non possunt habere aliquam similitudinem ad Deum, qui est ipsum esse. Ergo ea quae non sunt, non possunt sciri a Deo.
3 Objection 3: Further, the knowledge of God is the cause of what is known by Him. But it is not the cause of things that are not, because a thing that is not, has no cause. Therefore God has no knowledge of things that are not.
3 Praeterea, scientia Dei est causa scitorum ab ipso. Sed non est causa non entium, quia non ens non habet causam. Ergo Deus non habet scientiam de non entibus.
4 On the contrary, The Apostle says: Who... calleth those things that are not as those that are Rm. 4, 17).
4 Sed contra est quod dicit apostolus ad Rom. IV, qui vocat ea quae non sunt, tanquam ea quae sunt.
5 I answer that, God knows all things whatsoever that in any way are. Now it is possible that things that are not absolutely, should be in a certain sense. For things absolutely are which are actual; whereas things which are not actual, are in the power either of God Himself or of a creature, whether in active power, or passive; whether in power of thought or of imagination, or of any other manner of meaning whatsoever. Whatever therefore can be made, or thought, or said by the creature, as also whatever He Himself can do, all are known to God, although they are not actual.
And in so far it can be said that He has knowledge even of things that are not. Now a certain difference is to be noted in the consideration of those things that are not actual. For though some of them may not be in act now, still they were, or they will be; and God is said to know all these with the knowledge of vision: for since God's act of understanding, which is His being, is measured by eternity; and since eternity is without succession, comprehending all time, the present glance of God extends over all time, and to all things which exist in any time, as to objects present to Him.
But there are other things in God's power, or the creature's, which nevertheless are not, nor will be, nor were; and as regards these He is said to have knowledge, not of vision, but of simple intelligence. This is so called because the things we see around us have distinct being outside the seer.
5 Respondeo dicendum quod Deus scit omnia quaecumque sunt quocumque modo. Nihil autem prohibet ea quae non sunt simpliciter, aliquo modo esse. Simpliciter enim sunt, quae actu sunt. Ea vero quae non sunt actu, sunt in potentia vel ipsius Dei, vel creaturae; sive in potentia activa, sive in passiva, sive in potentia opinandi, vel imaginandi, vel quocumque modo significandi. Quaecumque igitur possunt per creaturam fieri vel cogitari vel dici, et etiam quaecumque ipse facere potest, omnia cognoscit Deus, etiam si actu non sint. Et pro tanto dici potest quod habet etiam non entium scientiam. Sed horum quae actu non sunt, est attendenda quaedam diversitas. Quaedam enim, licet non sint nunc in actu, tamen vel fuerunt vel erunt, et omnia ista dicitur Deus scire scientia visionis. Quia, cum intelligere Dei, quod est eius esse, aeternitate mensuretur, quae sine successione existens totum tempus comprehendit, praesens intuitus Dei fertur in totum tempus, et in omnia quae sunt in quocumque tempore, sicut in subiecta sibi praesentialiter. Quaedam vero sunt, quae sunt in potentia Dei vel creaturae, quae tamen nec sunt nec erunt neque fuerunt. Et respectu horum non dicitur habere scientiam visionis, sed simplicis intelligentiae. Quod ideo dicitur, quia ea quae videntur apud nos, habent esse distinctum extra videntem.
6 Reply to Objection 1: Those things that are not actual are true in so far as they are in potentiality; for it is true that they are in potentiality; and as such they are known by God.
6 Ad primum ergo dicendum quod, secundum quod sunt in potentia, sic habent veritatem ea quae non sunt actu, verum est enim ea esse in potentia. Et sic sciuntur a Deo.
7 Reply to Objection 2: Since God is very being everything is, in so far as it participates in the likeness of God; as everything is hot in so far as it participates in heat. So, things in potentiality are known by God, although they are not in act.
7 Ad secundum dicendum quod, cum Deus sit ipsum esse, intantum unumquodque est, inquantum participat de Dei similitudine, sicut unumquodque intantum est calidum, inquantum participat calorem. Sic et ea quae sunt in potentia, etiam si non sunt in actu, cognoscuntur a Deo.
8 Reply to Objection 3: The knowledge of God, joined to His will is the cause of things. Hence it is not necessary that what ever God knows, is, or was, or will be; but only is this necessary as regards what He wills to be, or permits to be. Further, it is in the knowledge of God not that they be, but that they be possible.
8 Ad tertium dicendum quod Dei scientia est causa rerum, voluntate adiuncta. Unde non oportet quod quaecumque scit Deus, sint vel fuerint vel futura sint, sed solum ea quae vult esse, vel permittit esse. Et iterum, non est in scientia Dei ut illa sint, sed quod esse possint.