Much of Grosseteste’s account of modality is concerned with difficulties posed by the notion of the eternal power of a proposition to be true or false without beginning. He seems to hold such powers to be possessed not in time, but in eternity. He notes that God too has eternal powers, namely to know or will without beginning, and that the difficulties confronting the eternal powers of propositions also confront the eternal powers of God. In fact, Grosseteste explains the eternal powers of propositions in terms of God’s eternal powers to know and will propositions, effectively grounding non-temporal modality in God’s powers or lack thereof (in the case of necessity and impossibility). He notes, for example, that “the eternal capacity for [the dictum] ‘that Antichrist was going to exist’ to have had truth and not to have had truth without a beginning is nothing but the capacity of God by which God was able from eternity and without a beginning to will or not to will that Antichrist will exist, or to know or not to know that Antichrist will exist” (Lewis 2017, 55).