Alvarez concludes that the real presence of things in eternity is the proper reason of God's certain knowledge
At the start of the next chapter he draws this conclusion: the actual existence of things in eternity, viewed from the side of God's eternity, is the proper reason why God knows all future things with certainty, contingent ones included.
The reason is that things present to a knower, though contingent in themselves, are already regarded as determinate. They are determinately true with respect to the measure in which they are present, and with respect to the knowledge by which they are known as present.
Latin
XXXI. In principio vero capitis sequentis inde colligit, Quod actualis existentia rerum in aeternitate, considerata ex parte divinae aeternitatis, est propria ratio, propter quam Deus certo cognoscit, omnia futura etiam contingentia. Idque quoniam ea quae sunt praesentia cognoscenti, quamvis secundum se contingentia sint, jam considerantur ut determinata, & ut determinate vera in ordine ad illam mensuram, in qua sunt praesentia, & in ordine ad cognitionem, qua ut praesentia sibi cognoscuntur.