[7] Moreover, God’s understanding has no succession, as neither does His being. He is therefore an ever-abiding simultaneous whole-which belongs to the nature of eternity. On the other hand, the duration of time is stretched out through the succession of the before and after. Hence, the proportion of eternity to the total duration of time is as the proportion of the indivisible to something continuous; not, indeed, of that indivisible that is the terminus of a continuum, which is not present to every part of a continuum (the instant of time bears a likeness to such an indivisible), but of that indivisible which is outside a continuum and which nevertheless co-exists with any given part of a continuum or with a determinate point in the continuum. For, since time lies within motion, eternity, which is completely outside motion, in no way belongs to time.
Furthermore, since the being of what is eternal does not pass away, eternity is present in its presentiality to any time or instant of time. We may see an example of sorts in the case of a circle. Let us consider a determined point on the circumference of a circle. Although it is indivisible, it does not co-exist simultaneously with any other point as to position, since it is the order of position that produces the continuity of the circumference. On the other hand, the center of the circle, which is no part of the circumference, is directly opposed to any given determinate point on the circumference. Hence, whatever is found in any part of time coexists with what is eternal as being present to it, although with respect to some other time it be past or future. Something can be present to what is eternal only by being present to the whole of it, since the eternal does not have the duration of succession. The divine intellect, therefore, sees in the whole of its eternity, as being present to it, whatever takes place through the whole course of time. And yet what takes place in a certain part of time was not always existent. It remains, therefore, that God has a knowledge of those things that according to the march of time do not yet exist.
[8] Through these arguments it appears that God has a knowledge of non-being. But not all non-beings have the same relation to His knowledge.
For those things that are not, nor will be, nor ever were, are known by God as possible to His power. Hence, God does not know them as in some way existing in themselves, but as existing only in the divine power. These are said by some to be known by God according to a knowledge of simple understanding.
The things that are present, past, or future to us God knows in His power, in their proper causes, and in themselves. The knowledge of such things is said to be a knowledge of vision. For of the things that for us are not yet God sees not only the being that they have in their causes but also the being that they have in themselves, in so far as His eternity is present in its indivisibility to all time.