This, too, is a passage I’ve noted before. In it, Zanchi builds on what he has said in sec. IV, which is to say that he draws out the implications of affirming that God’s essence is identical with his “essential properties.”
V. Nihil simpliciter tale esse aut fieri posse, qualis est Deus, nisi et simpliciter Deus esse possit.
Quapropter, qui aliquam creatam substantiam volunt fieri potuisse aut posse divinarum proprietatum, quibus talis sit, qualis est et Deus, ut simpliciter omnipotens et huiusmodi, participem, hanc quoque fateantur esse aut esse posse Deo ὁμοούσιον necesse est, quando neque Filius ipse simpliciter omnipotens est, nisi quia ὁμοούσιος est Patri, atque ita etiam Spiritus sanctus.
V. That nothing is or is able to become simply what God is, unless it is also able to be God simply.
Therefore, it is necessary that those who wish for it to have been possible or to be possible for any created substance to become a partaker of the divine properties, by which it would be what God also is (as simply omnipotent, and things of this kind), confess that this [created substance] is or is able to be homoousios with God, since not even the Son himself is simply omnipotent, except because he is homoousios with the Father; and so also the Holy Spirit [is omnipotent in this way]. 1